Events / Meetings

Development of Speed Crash Modification Factors using SHRP-2 RID Data

When: Thursday, August 12, 2021 -- 2:00 - 3:30 PM ET

This webinar is led by the ITE Satety Council, DDSA Working Group.

Webinar Description:

Investigating the effects of operating speed, roadway geometry, and traffic exposure on crash outcomes would significantly improve roadway safety. If these relationships are well understood and defined, the information can be used to advance existing safety improvement procedures to reduce crash frequencies and crash severities. Data-driven methods should be used to understand the relationships better. Conventional assessments typically utilize the corridor traffic volume and physical site characteristics. The lack of reliable operating speed data is the primary limitation on the development of reliable models of this relationship, especially on rural roadways.
This webinar summarizes research performed for Part A of the ongoing FHWA-funded project on “Development of Speed Crash Modification Factors (CMF) using SHRP-2 Roadway Information Database.” The project is divided into two parts – Part A (completed) and Part B (expected to initiate on August 1st, 2021). Part A included the technical and research efforts which were intended to determine the feasibility of a larger, more complete analysis in Part B and to produce final research products. The main objective of this research is to develop speed-related CMFs for the existing crash prediction models of the Highway Safety Manual (HSM). In Part A, the main objectives were focused on the feasibility of the speed CMF development by using rural two-lane (R2U) and rural multilane undivided (RMU) roadways. The analysis used three databases (SHRP 2 RID, NPMRDS, and HSIS) for these two facilities in Washington (WA) and North Carolina (NC).

Learning Objectives:
Attendees of this webinar will be able to:

  • Describe the background on the speed-safety topic and Highway Safety Manual (HSM).
  • Recognize the different data sources that provided a ground for speed-safety modeling in this research.
  • Explain the speed-related CMFs development process in states of Washington and North Carolina.
  • Potentially use the methodology to develop speed-related CMFs in their jurisdictions or transfer the developed ones appropriately.


  • Seyedehsan (Ehsan) Dadvar, RSP1, Transportation Research Engineer | CYFOR Technologies LLC | McLean, Virginia, United States
  • Subasish Das, Assistant Research Scientist | Texas A&M Transportation Institute | San Antonio, Texas, United States

ITE Members: $49.00
Non-Members: $99.00

This fee includes a live web event, an archived recording, webinar evaluation, 1.0 PDH credits, and a certificate of completion.

Group Pricing Available
ITE is offering as a member benefit a group pricing opportunity. If you are an ITE Member and want to sign up a group, you can do so at a discount.  To learn more and take advantage of this opportunity click here.