Data User's Corner

This area houses a collection of information that was developed for the use of the LTPP operations team, but which may also be helpful to end-users of LTPP data. A good starting place for visitors unfamiliar with LTPP is the LTPP jargon page.

2007 Comparison Testing of LTPP Profilers - Final Report

The report on the 2007 Comparison Testing of LTPP Profilers (otherwise known as the "Profiler Rodeo") contains comparisons of five LTPP-owned profilers (four ICC and one K.J. Law T-6600) with each other and with a Dipstick.

LTPP Manual for Profile Measurements and Processing

The LTPP Manual for Profile Measurements and Processing details inertial profilometer, dipstick and rod and level survey methodology at LTPP test section, as well as field and office data handling.

Rigid Pavement Design Spreadsheet

The Rigid Pavement Design Software is a Microsoft Excel spreadsheet that automates the design and analysis procedures for improved guidelines for portland cement concrete pavements as published in the 1998 Supplement to the AASHTO Guide for Design of Pavement Structures, Part II, - Rigid Pavement Design & Rigid Pavement Joint Design. The spreadsheet was developed to make it easier for highway managers and engineers to implement the improved guidelines, which were developed under NCHRP research and validated with LTPP data.

Please view the instructions before using the spreadsheet. More information on this product is available on the FHWA LTPP website.

LTPP Guide to Asphalt Temperature Prediction and Correction

The use of Falling Weight Deflectometers (FWDs) to provide input to pavement structural designs and rehabilitations has become common, and is expected to increase with the upcoming release of the 2002 Pavement Design Guide.

Because the deflection response of asphalt layers in a pavement structure to loads is strongly influenced by temperature, methods to calculate representative pavement temperatures and temperature correction factors are critical. This guide presents such methods developed using LTPP data.

Pavement Performance Database User Reference Guide

Everything you wanted to know about the LTPP Database, but were afraid to ask. This guide provides an in-depth look at the contents of the LTPP database, and productive ways to extract information from it. The structure of the database is discussed on a macro, middling and a micro scale. Helpful hints are imparted along the way, and a brief SQL tutorial is included in an appendix. The guide is available here for download in PDF format. It is 178 pages long, and 2 MB in size.

Table Navigator Online

Table Navigator Online

Table Navigator is sort of a online schema for the IMS (otherwise known as the LTPP database).

Table Navigator Offline

Table Navigator Version 1.7(13MB)

Table Navigator User's Manual

Directives

Directives are documents issued by the organization in control of LTPP (currently the FHWA LTPP team) which transmit directions to the various LTPP contractors. Some of them are for purely administrative purposes, such as those that deal with software upgrades. Others, such as those that deal with data collection practices, may be of great interest to analysts and others collecting similar data. Most of these Directives are converted from the original electronic files, except for some (primarily from the early days of LTPP) for which the electronic files could not be found. In these cases, the documents were scanned and the resulting files are significantly larger than the converted documents. Formatting details such as fonts and pagination may be inconsistent with the printed documents, and therefore these files should be used for reference purposes only.