Probe Data and Transportation Statistics

Probe data are generated by a technological device that is either carried by individuals or located on or in vehicles, vessels, or other conveyances.

Progress Towards Safer Rail Tank Cars Transporting Flammable Liquids: 2025 Report

This 2025 report summarizes progress made in upgrading North American rail tank cars transporting Class 3 flammable liquids to the DOT-117 specifications. The new DOT-117 specifications,...

Condition of U.S. Highway Bridges with Navigation Vertical Clearance Greater Than Zero

Precursor Safety Data Publications

The Precursor Safety Data Program regularly publishes reports summarizing activity and analysis related to its sub-programs. Visit individual focus area pages for a more complete lists of specific reports, or review some of the latest reports and other...

Confidentiality and Safety Data

As part of the Bureau of Transportation Statistics (BTS), the Precursor Safety Data Program supports BTS’ role as a federal statistical agency and its mission to collect and disseminate high-quality transportation information while upholding its legal and ethical obligations to...

About the Precursor Safety Data Program

The Precursor Safety Data Program, managed by the Bureau of Transportation Statistics (BTS) Office of Safety Data and Analysis, aims to improve safety within industries that include daily operational risk. The program accomplishes this by collecting and protecting data on close call...

Precursor Safety Data Program

The Precursor Safety Data Program is operated by the Bureau of Transportation Statistics (BTS) Office of Safety Data and Analysis to improve safety practices by understanding the factors...

Progress Towards Safer Rail Tank Cars Transporting Flammable Liquids: 2024 Report

This 2024 report summarize progress made in upgrading North American rail tank cars transporting Class 3 flammable liquids to the DOT-117 standards. The new DOT-117 standards, finalized in 2015, specify the...

Fleet Composition of Rail Tank Cars Carrying Flammable Liquids: 2023 Report

In accordance with the 2015 Fixing America’s Surface Transportation (FAST) Act, the Bureau of Transportation Statistics (BTS) released its Fleet Composition of Rail Tank Cars Carrying Class 3 Flammable Liquids: 2023 Report. The report discusses the progress in upgrading the rail tank car fleet...

Fleet Composition of Rail Tank Cars Carrying Flammable Liquids: 2022 Report

In accordance with the 2015 Fixing America’s Surface Transportation (FAST) Act, the Bureau of Transportation Statistics (BTS) released its Fleet Composition of Rail Tank Cars Carrying Class 3 Flammable Liquids: 2022 Report. The report discusses the progress in upgrading the rail...