Study Details

Study Title: Evaluation of Variable Speed Limits on I-270/I-255 in St. Louis

Authors: Bham et al.

Publication Date:OCT, 2010

Abstract: In May of 2008, MoDOT installed a "Variable Speed Limit" (VSL) system along the I-270/I-255 corridor in St. Louis. This project evaluated the VSL system and its potential impacts and benefits to the transportation users. The technical system evaluation focused on three areas - mobility, safety, and public and police perceptions. The VSL is not performing as desired in terms of improvements to overall mobility along the corridor, but is providing limited benefits to some segments. Noticeable benefits have been seen with respect to reduction in the number of crashes during the evaluation period. The driving public and law enforcement are widely dissatisfied with the VSL system based on their perceptions of benefits to congestion relief, compliance with posted speed limits, and overall visibility of the current sign configuration.

Study Citation: Bham, G. H., Long, S., Baik, H., Ryan, T., Gentry, L., Lall, K., Arezoumandi, M., Liu, D., Li, T., and Schaeffer, B., "Evaluation of Variable Speed Limits on I-270/I-255 in St. Louis." RI08-025, Missouri University of Science and Technology, Rolla, MO., (2010).

Study Report: Download the Study Report Document

CMFs Associated With This Study

Category: Speed management

Countermeasure: Install variable speed limit signs

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.9282 StarsAllAllPrincipal Arterial InterstateUrban