TRB Webinar: Guidance for Setting Speed Limits

July 26, 2021 02:00 PM - 03:30 PM U.S. Eastern
Cost (for your seat)
Professional Development Hours for this webinar
1.50 hour(s)
Continuing Education Hours for this webinar
AAE: 0.00 hour(s)
AICP: 0.00 hour(s)
CLE: 0.00 hour(s)

Several factors are considered within engineering studies when determining the posted speed limit, including the 85th percentile speed during free-flow conditions and the segment’s crash history. TRB will host a webinar on Monday, July 26, 2021, from 2:00-3:30 PM Eastern that will discuss a new speed limit setting procedure and tool (SLS-Tool) developed to aid in making informed decisions about the setting of speed limits. The development of the SLS-Tool considered previous research along with current research data from Austin, Texas and Washtenaw County, Michigan. 

This webinar features research from NCHRP Research Report 966: Posted Speed Limit Setting Procedure and Tool, NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool, and two versions of the SLS-Tool:

N17-76 SLS-Tool (with macros) and

N17-76 SLS-Tool (without macros)


Some registrants will need to pay $95 to attend this webinar. Sign into to view registration information.

Webinar agenda and presenters

  1. Overview: Kay Fitzpatrick, Texas A&M Transportation Institute
  2. Findings from Michigan: Tim Gates, Michigan State University
  3. Findings from Texas: Kay Fitzpatrick, Texas A&M Transportation Institute
  4. SLS Procedure and Tool demonstration: Michael Pratt, Texas A&M Transportation Institute
  5. Question and answer session: Moderated by Kevin Haas, Oregon Department of Transportation

The first 60 minutes of the webinar will be for presentations and the final 30 minutes will be reserved for audience questions.

Learning Objectives

At the end of this webinar, participants will be able to:

  1. Identify factors that determine speed limits
  2. Compute a suggested speed limit using the SLS tool


Professional Development Hour Information

Professional engineers (PEs) who register and attend the entire webinar as an individual will be awarded 1.5 Professional Development Hours (PDHs). TRB’s webinar program awards PDH credits only to the registered individual, and not to other members of a group that view the webinar together. To be eligible for the credits, individuals must remain signed in for the entire webinar, including for any question and answer session following the presentations.

Please check with your licensing board to ensure that TRB webinar PDHs are approved by your board.

TRB will report credits earned to the Registered Continuing Education Program (RCEP). Complaints about registered providers may be sent to RCEP, 1015 15th Street, NW, 8th Floor, Washington, D.C., 20005.

Pre-registration is required. Once the webinar starts, you will be unable to register. Individuals that are registered for a webinar but do not receive their confirmation emails due to their organization’s internal firewalls should contact the TRB Helpdesk for assistance in signing in.

View our FAQ page for more information.

Registration questions? Contact Beth Ewoldsen.