Mr. Groeger has almost 20 years of experience related to the LTPP Program. His experience with LTPP includes the areas of material characterization, development of the IMS database and activities related to the development and maintenance of the GPS and SPS experiments. Currently Mr. Groeger serves as the LTPP TSSC Project Manager. In this role he is responsible for coordination with FHWA, contractual compliance, budgeting and invoicing.

Mr. Groeger has served as the Work Order Leader for Materials Characterization on the Long-Term Pavement Performance Technical Assistance Contract (TAC) and the LTPP Technical Services Support Contract (TSSC) with the Federal Highway Administration. Although this was his primary area of involvement in the LTPP program, Mr. Groeger also has had selected responsibilities in the areas of (1) development of specifications and overview of the LTPP Information Management System, (2) development of procedures and specifications for the quality control and quality assurance (QC/QA) checks performed on data in the IMS, and (3) providing technical support in the review, assessment and overview of the existing LTPP experiments and LTPP field operations.

Mr. Groeger was a leader of the development of Version 2.0 of the “SHRP-LTPP Guide for Field Material Sampling and Testing.” These guidelines detail the field operational procedures for obtaining, packaging, shipping, storing and accounting for samples obtained from the LTPP program. In addition, he has been directly responsible for development and maintenance of the “SHRP-LTPP Interim Guide for Laboratory Material Handling, and Testing (PCC, Bituminous Mixtures, Aggregates and Soil).” These guidelines detail the laboratory operational procedures for the receipt, handling, storage and testing of all of the samples retrieved from the LTPP program.

Mr. Groeger has been involved in the development of over forty-three testing protocols and test data reporting forms for use in conducting and recording the materials testing results for the LTPP program. In addition, Mr. Groeger has produced over twenty Materials Directives for this program.

Mr. Groeger was also responsible for the development of the resilient modulus testing program from 1990 to 1999. This included development of the testing procedures, quality control/quality assurance procedures, data reporting and data acceptance procedures for this facet of the project. Of particular note, Mr. Groeger was directly responsible for leading the team that developed the P46 (Resilient Modulus of Unbound Base, Subbase and Subgrade Soils) Startup and Quality Control Procedure. The implementation of this procedure has significantly reduced the within and between laboratory variability of this test procedure and has the potential to enhance the stature of this testing process in the materials testing community. Mr. Groeger has also been involved with the implementation of the resilient modulus testing procedures within AASHTO.

Ms. Ostrom’s experience with LTPP dates to her acceptance of an Eisenhower Graduate Research Fellowship at FHWA’s Turner-Fairbank Highway Research Center in 1994 to investigate truck loading. Her actual introduction to the program, however, occurred during her tenure at the Maryland State Highway Administration as a participant in the site selection process.

From 1994 to 1995, Ms. Ostrom worked as a researcher on the traffic data with the LTPP Division. Her efforts focused on factors affecting Equivalent Single Axle Loading estimation due to data sampling and expansion techniques for FHWA’s Long-Term Pavement Performance program.

From 1995 to1999, Ms. Ostrom worked as on-site consultant staff in support of the LTPP Division and later the LTPP Team. Her focus was initially on truck data research. Over time she assumed responsibility for the IMS and served as the first Customer Support Services team member establishing the basic practices of that activity. She also became custodian of the CTDB and established an index to check on the quantity and availability of data at both the national and regional levels. The work of the EBA contract under which she was hired to provide for metrication of the database was successfully concluded with a directive on the topic and specifications for metricating all aspects of the IMS.

In February of 1999, Ms. Ostrom joined LAW/PCS and assumed responsibility for their traffic data activities and the IMS. While leading the task on IMS development, the transition to new IMS software and the creation of guidelines for writing specifications was completed. When she became exclusively focused on the traffic aspects of the LTPP program she oversaw the transition of the traffic software from SAS and the technical development of the SPS Traffic Pooled Fund Study.

Ms. Ostrom has been involved in various aspects of transportation and traffic engineering since 1982, beginning with her 8 year tenure as head to the Traffic Forecasting Section for the Maryland State Highway Administration. She was involved in MDSHA’s early efforts to improve truck data information for pavement design by overseeing the development of the ESAL estimation process that is still in use. She is a member of TRB Committee A2B08, Highway Traffic Monitoring, which works to advance the state of the practice.

Mr. Miller has 25 years of experience in the pavement engineering and construction aspects of the transportation industry. This has included many years of effort with the LTPP program along with varied experience in pavement evaluation, pavement design, geotechnical and materials engineering and construction observation. In all of these work areas Mr. Miller has performed technical, administrative and supervisory activities.

Mr. Miller has 13 years of experience with the LTPP program and he is currently the Co-Principal Investigator for the FHWA LTPP Technical Service Support Contract and Task Leader for Monitoring. Mr. Miller has worked in all aspects of the LTPP program with particular emphasis on distress data collection, development of field sampling and laboratory testing procedures, test section construction guidelines, and construction data collection guidelines. This experience also includes assisting in development of the IMS database. A major activity has involved providing information in answer to questions and problems arising from GPS and SPS construction related issues; both to the Regional Contractors and to participating highway agencies. This has included site visits, briefings and telephone support as a means to promote consistency across the LTPP program.

Some of the highlights of his LTPP experience include the following:

• Provided technical guidance and development effort to both SHRP and later to FHWA for revisions to the SHRP-LTPP Distress Identification Manual. This effort resulted in SHRP Report P-338, Distress Identification Manual for the Long-Term Pavement Performance Project.

• Took an active role in the distress data collection process quality assurance work by developing and conducting the Distress Identification Workshops and Distress Rater Accreditation program.

• During SHRP Mr. Miller developed sampling and testing plans for use in the General Pavement Studies\u2019 requests for quotations on the regional sampling and testing contracts and the laboratory testing contracts. He also developed detailed guidelines to be used for developing field sampling and laboratory testing plans for the Specific Pavement Studies experiments 1, 2, 5, 6, 7, 8 and 9A.

• His roles as Co-Principal Investigator of the LTPP Technical Assistance Contract and LTPP Experiments Work Order Leader have required extensive coordination with LTPP staff, sub-contractor staff, other LTPP contractors, participating highway agency personnel, and various LTPP Expert Task Groups.

• Mr. Miller has made numerous presentations concerning the LTPP program to the various LTPP Expert Task Groups, Regional Meetings, and industry conferences.

• During the SHRP and continuing under the FHWA LTPP effort, Mr. Miller developed construction guidelines necessary for participating agencies to construct test sections conforming to experiment requirements for Specific Pavement Studies experiments 1, 2, 5, 6, 7, 8 and 9A.

• In order that the appropriate data from the test sections could be collected, stored, and later retrieved from the IMS Mr. Miller lead development of data collection guidelines for the Specific Pavement Studies experiments 1, 2, 5, 6, 7, 8 and 9A.

• He has provided technical review of SPS project nominations, including review of contract documents for conformance to experiment needs, and review of field sampling and testing plans. As a follow-on activity, review of construction reports for conformance of the completed construction to experiment requirements was also undertaken.

Dr. Simpson has been involved in LTPP since 1992 when she began working on the first data analysis contract using the LTPP database. As part of this contract, she was responsible for retrieving the data from the database, performing preliminary analyses to examine the data for outliers and influential observations. The objective of these analyses was to perform an analysis to determine the sensitivity of rutting, roughness, and cracking to the various asphalt pavement parameters.

Additionally, Dr. Simpson assisted in the management of the Southern Region Coordination Office database. In this capacity, she was responsible for performing quality checks on materials and monitoring data. She reviewed data prior to entry into the database and performed quality control checks on the data after it had been entered. Dr. Simpson also led a task to collect performance data on edge drains installed at all of the SPS-1, SPS-2, and SPS-6 projects.

Dr. Simpson was also part of the project team holding the first LTPP Data Analysis Technical Support contract let by the Federal Highway Administration. As part of this contract, Dr. Simpson developed computed parameters for the evaluation of rut depth on the asphalt test sections. She assisted in completing backcalculation on all of the FWD data collected through 1997. She assisted in a time series review of the distress data collected by the four regional offices and the automated PASCO distress collection.

Dr. Simpson joined LAW PCS and the Technical Support Services team in 2002. Her primary involvement has been in assisting in the review of technical issues associated with monitoring data.

In addition to her experience in the LTPP program, Dr. Simpson has been involved in a variety of projects ranging from research to practical application work. She has conducted numerous pavement evaluations. These studies included deflection testing and analysis of these data. She has also been involved in projects in the area of pavement management for several municipalities. She has authored and co-authored numerous publications in these She is active in professional organizations including the Transportation Research Board (TRB), American Society of Civil Engineers (ASCE) and National Society of Professional Engineers (NSPE).

Dr. Xu has worked on the LTPP project since April 2002. Currently, his focus is on the Monitoring and Traffic Projects. Dr. Xu developed or enhanced several analysis programs for pavement smoothness analysis using both short wavelength and long wavelength approachs. He helped upload new traffic tables to the IMS database and developed software to compute ESAL values using the existing IMS tables.

From 1997 to 2001, Dr. Xu studied and worked as a research assistant in North Carolina State University. The main project he worked on was NCHRP 10-48 project: Assessing Pavement Layer Conditions Using FWD deflections. He developed dynamic, nonlinear finite element models to simulate pavement behaviors under FWD loading. Based on these models, he further developed new condition evaluation procedures for asphalt pavements. Dr. Xu's other research includes application of artificial neural network techniques in pavement engineering, development of temperature and structural correction factors for critical stresses/strains within pavements, estimation of subgrade nonlinear model constants using FWD deflections, and prediction of pavement remaining life using multi-load level FWD deflections.

Mr. Elkins began his experience with the LTPP program as Technical Director for the Prime Contractor on the first LTPP Technical Assistance Contract (SHRP P-001) initiated in 1987. In this role, he coordinated a multi-discipline consultant team of professionals that provided SHRP central staff with technical assistance for the development, implementation and central coordination of the LTPP study. In addition to overall technical coordination of the contract staff, he was directly in charge of development of the Specific Pavement Studies (SPS) portion of the LTPP program. In this role he developed the experimental design of the experiments, uniform construction guidelines, data collection guidelines, project nomination guidelines, and material testing guidelines for this nationwide program. He also participated in test section recruitment and selection, development and refinement of data collection guidelines, and creation of monitoring policies. Mr. Elkins also served as the resident liaison with SHRP staff in Washington DC for 1-1/2 years.

In 1990 Mr. Elkins began service as Co-Principal Investigator for operation of the Western Region LTPP Coordination Office. Mr. Elkins role in the LTPP Western Region Office included responsibility for coordination and review of all technical services activities associated with the data collection, data processing, and data storage in the Western Region IMS for the over 500 test sections located in the SHRP Western Region. Cooperative working contacts were developed with all of the state and provincial highway agencies in the West to coordinate the execution of this work. Data collection on the test sections included: inventory, materials, deflection, roughness, distress, friction, rehabilitation, maintenance, environmental, traffic, and in-situ instrumentation. Mr. Elkins was also responsible for technical assistance and coordination with participating highway agencies for the construction of test sections for the Special Pavement Studies experiments on Structural Factors for Flexible and Rigid Pavements (SPS I & 2), and instrumentation of Seasonal Monitoring Program test sections.

In 1995, Mr. Elkins joined MACTEC to work on the LTPP Technical Assistance Contract. He currently servers as a Principal Investigator on the LTPP Technical Support Services Contract with the FHWA with overall technical responsibility for TSSC responsibilities, aincluding task leadership for Maintenance of LTPP Experiments and Regional Operations, technical engineering support for IMS Customer Service, and technical support for pavement monitoring and instrumentation activities. In addition, he has performed special assignments such as leading the 1996 assessment of the LTPP program to produce priority products from its research, chairman of the LTPP Pavement-Traffic Committee, development of position papers on key program issues, participation in forensic studies, and coordination with highway agency officials, and other LTPP contractors. Mr. Elkins has taught training sessions for LTPP regional coordination office contract staff and has made numerous technical presentations on all aspects of the LTPP program at national LTPP meetings, TRB committees, National Academy of Sciences Expert Task Groups, LTPP Advisory Committee, and at industry conferences.

Mr. Elkins brings 30 years of transportation research, pavement engineering and project management experience to the team. Mr. Elkins began his professional career with Austin Research Engineers in 1978, rising to the position of Research Division Manager. During this time period he also had concurrent employment with Texas Research and Development Foundation, where he became Vice-President and Technical Director. In 1990, he joined Nichols Consulting Engineers as Vice-President and Chief Engineer.

Mr. Schmalzer has worked on the LTPP Technical Support Services Contract since July of 1999. In that role he has worked on many projects in the Materials, Monitoring and IMS tasks. These tasks include test protocol development, database design, software development and quality assurance reviews of regional operations, materials test data and FWD calibration centers.

Prior to joining LAW PCS, Mr. Schmalzer worked for four years as a Laboratory Technician for the Cornell Local Roads Program. His duties included materials characterization testing, resilient modulus specimen preparation, laboratory equipment maintenance, falling weight deflectometer (FWD) reference load cell calibration, FWD maintenance and training student interns in basic pavement management systems.

Since joining MACTEC, Mr. Schmalzer has also performed pavement rehabilitation designs for Maryland State Highway Administration, various FWD testing and analysis projects, pavement management system implementations, and distress, profile and FWD data analysis software development in addition to his LTPP duties.

Starting in 2000, Travis has worked on the FHWA LTPP Technical Service Support contract performing database support and data analysis. he is the task leader for Information management System (IMS) development and operations. He has overall technical responsibility for all aspects of LTPP database development. He is responsible for the resolution of Software Performance Reports and Data Analysis/Operations Feedback Reports assigned to the TSSC, and has assisted in the development and documentation of several LTPP FWD software programs.

While working for the City of Renton, WA, Travis performed many functions for the Pavement Management System, including PCI surveys, PCI calculations, and report creation. He also performed construction inspections on AC overlay projects.

Mr. Plett has been involved with the LTPP study from 1989 when he began serving as the Traffic Database Manager for the NARO (North Atlantic Regional Office). He was responsible for populating and maintaining the LTPP traffic database as well as for advising state and provincial project participants in acquiring and operating equipment for the collection of traffic data and ensuring that this data was generated according to FHWA specifications for quality and accuracy.

In addition, he participated in all aspects of data collection, processing and storage during initiation and field start-up of the LTPP (SHRP) project. This included collection and documentation of AC, PCC and granular material samples, operation of pavement deflection and profile data collection equipment as well as processing and storing the data. He also participated in the installation of equipment for the Seasonal Monitoring Program (SMP).

Since 2001, Mr. Plett has provided leadership to data-intensive aspects of traffic, pavement management and quality control projects with MACTEC. He has applied his knowledge and expertise in system integration, database design and management, data integration and application development.

From 1998 to 2000 Mr. Plett was a team leader for Infrastructure Management Systems development projects in Canada and the United States. He was responsible for assessing client’s needs, then using the expertise of the GIS/GPS team to provide data in spatial and tabular form to create new databases or to complement existing client systems. The tools used in these projects were primarily Trimble PRO XRS receivers, Vocarta voice-to-data software, ESRI ArcView GIS software and proprietary PMS software to enable a quick and efficient population of client databases.

Ms. Pitz has supported the FHWA’s LTPP database system since 1995. Since late 2000, Ms. Pitz has provided management support for the LTPP contract. She writes the monthly and quarterly status reports, maintains the SPR database, and provides semi-monthly SPR progress reports. She also coordinates system modifications precipitated by individual SPRs, and provides support to the four regional offices.

In 1997, Ms. Pitz assisted in migrating the system from an Alpha mainframe computer to a distributed, multiuser, Windows NT environment. During and since the migration, she has used Oracle Developer 2000 to develop and maintain over 400 forms and reports that comprise this system.

In 1997, Ms. Pitz became the Customer Support Service Team Leader for the LTPP database. She coordinates responses to users’ requests for LTPP data, materials, program information, and provides technical support on tools available to analyze the data. Ms. Pitz developed a request tracking database in Oracle, including entry forms and reports. She also developed the original LTPP Database Web Page.

Since 1996, Ms. Pitz has maintained the LTPP system documentation, including the QA manual, the Data Dictionary, and the codes listing, She also developed and maintains the process documentation for the project.

From 1991 to 1995, Ms. Pitz enhanced, maintained, and provided customer support for the Profile-Driven Bibliographic System (ProBE) for the U.S. Department of Energy (DOE) Office of Scientific and Technical Information (OSTI). In addition, she maintained and enhanced the Statistics and Tracking System (STS), which tracked records as they moved through the cataloging system at OSTI. Ms. Pitz was also a member of the Software Process Improvement committee that developed SEI Level 3 procedures for software process maturity on the OSTI contract. She provided QA support when necessary.

From 1988 to 1991, Ms. Pitz provided computer technician/data entry support to SHRP at Brent Rauhut Engineering Inc. She assisted in maintaining the SHRP’s southern region database. She performed a variety of database management functions ranging from data entry, data quality assurance, database updates, and backups to data analysis.

Mr. Clark has provided support to the LTPP project since 1988. He currently serves as DBA on the FHWA’s LTPP project. Previously, he provided DBA, Oracle Forms, PRO*C, and systems administration support for the SHRP LTPP IMS development effort. Mr. Clark has also provided ongoing maintenance support for the FHWA LTPP IMS database and applications.

Mr. Clark has 17 years of experience in the design, development, and maintenance of hardware and software for internet applications, data retrieval, electronic mail, and real-time systems on a variety of platforms using diverse software tools. Mr. Clark has been instrumental in solving technical problems on a variety of projects and platforms and in recommending and analyzing new technology and solutions. He is also experienced in diagnosis of asynchronous and network communications problems, including Ethernet, modem links, and RS-232 cabling and has assisted in the management of a 100-user Novell NetWare 3.11 network.

Mr. Clark recently supported the data migration efforts of a major pharmaceutical company during the acquisition of selected assets from another company. For another pharmaceutical client, he assisted with the creation of a complex compound ordering system using Java and Oracle.

Mr. Clark provided extensive support for the Georgia Department of Transportation (GDOT) TPro project. He used Visual Basic and JavaScript to implement an IIS web application that interfaces to GIS and Oracle databases.

As required, Mr. Clark also provides ORACLE DBA and programming support to the Shipment Mobility and Accountability System for the U.S. Department of Energy (DOE) and the Nuclear Regulatory Commission (NRC), developing PRO*C programs to load data and user exits to enhance forms capabilities. He analyzes storage requirements and index needs for ORACLE databases and develops ORACLE forms and reports.

Mr. Clark assisted a major insurance company by developing a C++ program that monitors keystrokes and on-screen data from a mainframe session and retrieves the associated documents from openImage.

Ms. Herron has supported LTPP Traffic software since July 2000. Support has included modifications and enhancements to the LTPP QC software and development of Traffic Analysis software. Both are coded in Visual C++ as the front end and Oracle 8i as the database/backend. She utilizes Oracle Enterprise Manager's SQL Worksheet during development. Ms. Herron also uses Oracle utilities Import/Export and scripts in support of the Traffic software.

Ms. Herron has over 18 years experience in software development projects that encompass the entire computer system life cycle. She has been involved in government and commercial sector software development on a variety of platforms in the areas of requirement specifications, analysis, design, development, testing, user training/support, relational database (RDB) development, maintenance, and object oriented (OO) analysis.

Dr. Kohn managed portions of the SHRP program, now the FHWA-LTPP program in six states in the North Central Region from the start of the program until 1995. During this period, he managed the profile data collection program for all 13 states in the North Central region. During this period SME was a subcontractor to Braun Intertec who was the regional contractor for the North Central region. Dr. Kohn was involved in site selection and materials sampling and testing for GPS and SPS sites. He was involved with the construction activities of SPS projects that were built in Michigan, Ohio, Indiana and Missouri.

From 1997 to date, Dr. Kohn has worked on the LTPP Technical Support Services Contract as a subcontractor to MACTEC. During this period, Dr. Kohn provided FHWA with technical assistance in the pavement profiling activities and materials testing activities.

Dr. Kohn organized the first ever comparison of the four LTPP profilers in 1991. This comparison was held in Ann Arbor, Michigan. He has supervised the analysis of profile data from the three LTPP profiler comparisons that were held subsequently. Dr. Kohn supervised the acceptance testing of the four K.J. Law T6600 profilers that were purchased by FHWA in 1996. Dr. Kohn also supervised the data analysis of the profiler comparison that was held in August 2001 as a result of the RFP put out by FHWA to pre-qualify vendors for purchasing of four new profilers. Dr. Kohn is a co-author of the LTPP profiler manual that provides guidelines on profile data collection for the LTPP program.

Dr. Kohn brings 30 years of pavement engineering and research related experience to the team. Besides his LTPP work, Dr. Kohn has served as the Principal Investigator or Co-Principal investigator for the following major projects: NCHRP Project 10-47, Guidelines for Longitudinal Profile Measurements; NCHRP Project 20-50(08/13): LTPP Data Analysis: Factors Affecting Pavement Smoothness; NCHRP Project 20-51(01): Workshop on Pavement Smoothness; and FHWA Project Investigation of Development of Pavement Roughness.

Dr. Perera has been involved in the LTPP program since 1991. Dr. Perera was involved in profiling activities of the North Central region from 1991 to 1995, when SME served as a subcontractor in the North Central region. In 1996, Dr. Perera was involved with acceptance testing activities of the four new profilers that were purchased by FHWA. From 1997 to date Dr. Perera has been working on the LTPP Technical Support Services Contract as a subcontractor to MACTEC. During this period, Dr. Perera provided FHWA with technical assistance in pavement profiling activities. He also assisted in resolving problem reports that were generated by the LTPP Regional Contractors.

Dr. Perera has analyzed data for all LTPP profiler comparison studies that have been held since 1991. These comparison studies were held in 1991 in Ann Arbor, Michigan; 1992 in Ames, Iowa; in 1998 in Urbana-Champaign, Illinois; and 2000 in College Station, Texas.

Dr. Perera performed the acceptance testing of the four K.J. Law T6600 profilers that were purchased by FHWA in 1996. Dr. Perera was involved in organizing and analyzing data for the profiler comparison that was held in August 2001 as a result of the RFP put out by FHWA to pre-qualify vendors for purchasing of four new profilers by FHWA.

Dr. Perera developed the LTPP profiler manual that provides guidelines on profile data collection for the LTPP program. After LTPP purchased new T6600 profilers in 1996, the profiler manual was revised to reflect the operation of the new profilers. Dr. Perera developed the Pavement Smoothness Specifications for LTPP WIM locations that is outlined in the Data Collection Guide for SPS WIM sites.

Dr. Perera brings 21 years of pavement engineering and research related experience to the team. Besides his LTPP work, major studies in which Dr. Perera has played a major role are NCHRP Project 10-47, Guidelines for Longitudinal Profile Measurements and NCHRP Project 20-50(08/13), LTPP Data Analysis: Factors Affecting Pavement Smoothness.

Mr. Hallenbeck is Director of TRAC, has worked with SHRP and LTPP staff and Expert Task Groups to resolve LTPP traffic data concerns for over fourteen years. He was the principal designer of the current LTPP traffic data collection program and the architect of the LTPP traffic database. He also designed the quality assurance program that is applied to all collected traffic data, and wrote the initial draft calibration and validation specifications for weigh-in-motion equipment being purchased under LTPP’s pooled fund study in support of traffic data collection.

Outside of LTPP, Mr. Hallenbeck has worked extensively with traffic data at both the national and state levels. At the national level, he completed the 2001 Edition of FHWA’s Traffic Monitoring Guide, the reference used by all State DOTs for refinement of their traffic monitoring programs. He was the primary author of two chapters of the AASHTO report Guidelines for Traffic Data Programs. Analytically, he has contributed most recently at the national level by performing a study for FHWA that updated the default vehicle classification values used within the FHWA Highway Performance Monitoring System (HPMS) software. At the state level, Mr. Hallenbeck is responsible for the design of the current traffic data collection program for the Washington State Department of Transportation (WSDOT). He also designed the flow of traffic data within WSDOT’s current traffic management software system. He has performed a wide variety of equipment calibration and verification tests for WSDOT, as well as designing their WIM data collection program.

Outside of LTPP related traffic data, Mr. Hallenbeck is one of the nation’s experts on the use of traffic information for performance monitoring. The Central Puget Sound Freeway Network Use and Performance report is among the nation’s foremost examples of Archived Data User Services (the storage and use of ITS data streams for management and planning purposes.) He serves on two TRB data committees, as well as on three national task forces looking at new technologies and programs that collect or use traffic data in innovative ways.

Mr. Hallenbeck also holds an affiliate faculty position in the Department of Civil and Environmental Engineering at the University of Washington. In that position, he normally teaches one course per year. In 2002, he is teaching Intelligent Transportation Systems.

Dr. Hall’s experience with LTPP dates back to before the start of the program. In 1984 and 1985, she was involved in the original development of the GPS and SPS experiment designs, under FHWA contracts for Technical Support for the Long-Term Pavement Monitoring (LTM) Program and Development of Strategic Highway Research Program (SHRP) Long-Term Pavement Performance (LTPP) Implementation Plan. In 1987, she worked on the revision of the Distress Identification Manual for the Long-Term Pavement Performance (LTPP) Studies. In 1992, she developed the backcalculation solutions for concrete pavements in the LTPP experiments, under the SHRP P-020 contract. In 1994, she directed the study LTPP Data Analysis Phase I: Validation of Guidelines for k-Value Selection and Concrete Pavement Performance Prediction. The k-value guidelines and concrete pavement performance model tested in this study, using data from the GPS-3, GPS-4, and GPS-5 experiments, were developed under NCHRP Project 1-30, Support Under Concrete Pavements, and were published in the 1998 Supplement to the AASHTO Guide.

Dr. Hall has been the Principal Investigator for three recent NCHRP studies involving LTPP data analysis: Project 20-50(02), LTPP Data Analysis: Relative Performance of Jointed Plain Concrete Pavement with Sealed versus Unsealed Joints [an analysis of the supplemental SPS-4 experiments in Arizona, Colorado, and Utah], Project 20-50(03/04), LTPP Data Analysis: Effectiveness of Maintenance and Rehabilitation Options [an analysis of the SPS-3, SPS-5, and SPS-6 experiments], and Project 1?34C, Effects of Subsurface Drainage on Performance of Asphalt and Concrete Pavements [an analysis of the SPS-1 and SPS-2 experiments].

Dr. Hall’s other research and consulting experience includes development of the EXPEAR system for concrete pavement evaluation and rehabilitation, revision of the AASHTO Guide’s overlay design procedures, analysis of the performance of asphalt-overlaid concrete highway pavements and development of guidelines for their evaluation and rehabilitation, and development of the National Highway Institute course Concrete Pavement Design Details and Construction Practices, and development of guidelines for project-level evaluation and rehabilitation strategy selection for asphalt, concrete, and asphalt-overlaid concrete highway pavements (NCHRP Project 1-38).

Dr. Charles W. Schwartz is an Associate Professor of Civil and Environmental Engineering at the University of Maryland, where he teaches courses and conducts research in the areas of pavement engineering and geomechanics. His research interests and experience span the areas of analytical and numerical modeling techniques for pavement structures and characterization and laboratory testing of pavement materials. He currently is Co-Principal Investigator for the Superpave performance models project (NCHRP Project 9-19) and Project Director for the University of Maryland portion of the AASHTO 2002 Pavement Design Guide development effort. Dr. Schwartz in the past has also been active in the development and implementation of pavement management systems for airfield and highway pavements, including the Integrated Airfield Pavement Management System (IAPMS) currently in service at John F. Kennedy, Newark, and Laguardia International airports and others.