A&I Resource Center

The LTCCS dataset consists of aggregate data tables. FMCSA has collaborated with the National Highway Transportation Safety Administration to develop a web-based case viewer. The viewer will allow users to filter the study dataset for specific crash types or factors and review the resulting case information. The information available for each case includes a crash summary, photographs, crash scene diagrams, vehicle and driver inspections, and other information for each involved vehicle.

This report provides the background and methodology of the LTCCS, including a discussion about crash causation, critical events, and associated factors. It also describes the collaborative effort by FMCSA and NHTSA resulting in a nationally representative sample of 1,000 large truck fatal and serious injury crashes over a three-year period.

This document discusses how statistical analyses of the LTCCS database can be used to investigate crash causes and contributing factors. It defines 10 critical issues for large truck safety, outlines the information needed to address each, assesses how well the LTCCS database fills those needs, and discusses other data that could be used for questions where LTCCS data are not adequate.

Addresses the most frequently asked questions about the LTCCS.

This presentation examines the LTCCS crashes between a single large truck and a single passenger vehicle (cars, pickup trucks, vans, SUVs). It presents critical reasons and associated crash factors for both classes of vehicles, and reports those factors that increase the risk of truck-car crashes. Speaker notes are included.

The LTCCS Codebook provides a listing of every variable and code level in each data file, including the distribution of records, code values in the file, labels associated with each code value, data storage type, variable storage length, and format entry, if any. The Codebook also includes an appendix with tables that can be used to estimate standard errors and confidence intervals for estimated totals of variables contained in the data sets.

The LTCCS Analytical User's Manual provides guidance on the variable definitions and codes for all the data sets included in the study.

This 2006 presentation provides an overview of the LTCCS. It includes how the study defines causation; study data collection; key variables coded for the study; coding example for a crash; critical events, critical reason, and associated factors for the crashes; and an example of how the data can be analyzed. Speaker notes are included.

This presentation illustrates the strengths and limitations of the LTCCS data using experience from three research projects.

The Motor Carrier Safety Improvement Act of 1999 (MCSIA), P.L. 106-159, mandated the LTCCS to determine the causes of, and contributing factors to, crashes involving commercial motor vehicles. In March 2006, FMCSA submitted a report to Congress detailing the study's principle findings.