OHS: Integrating Speed Measures into Roadway Database

Abstract OHS, Integrating Speed Measures into Roadway Database 10/01/2022 – 09/30/2023 The project aims to derive speed measures from the 2015-2019 probe vehicle data acquired by the KYTC and integrate them with roadway database. This will make the roadway database more complete and enhance various analyses on traffic operation and safety. Speed is a critical piece of information of roadways. It is indicative of traffic operating conditions on the roadways. It is also one of the major factors in roadway safety performance. In particular, higher operating speeds can result in more severe crashes, because the crash energy is associated with the square of the operating speed. The speed data have been traditionally limited in Kentucky due to the cost associated with data collection at a large scale. With the advancement in data collection techniques, speed data have become widely available across the network. The statewide probe speed data acquired by the KYTC between 2015-2019 offer extensive coverage of all types of roadways in the state. Therefore, it is beneficial to develop various speed measures and integrate them into roadway database to make it more complete. The improved database will be valuable to different types of analyses, e.g. incorporating speed into safety performance functions. Objectives To derive various speed measures that can inform traffic operating conditions on Kentucky roadways and enhance safety analysis. To integrate speed measures with current HIS roadway database and as a result, make the database more complete. The goal is make speed information available to all the public roadways in Kentucky.