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Variable speed limit systems reduced the number and severity of crashes at three pilot sites in Texas. Benefit-to-Cost ratios ranged from 7:1 to 14:1.

FINDINGS The table below excerpted from the source report shows the potential B/C ratios. The benefits predicted in these deployments were based on a seven percent reduction in crashes estimated…
Content type
Benefit
Date Posted
09/15/2017
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
San Antonio, Texas, United States   |   Temple, Texas, United States   |   Ranger Hill, Texas, United States

Variable speed limit system site selection should be rigorous and incorporate analysis of existing speed profiles and roadway ingress/egress characteristics to assure proper spacing of VSL systems and sensor inputs.

Primary lessons learned from the pilot tests included the following: Use permanent equipment preferably mounted over travel lanes. Temporary equipment was not suitable for long-term operations.…
Content type
Lesson
Date Posted
09/15/2017
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
San Antonio, Texas, United States   |   Temple, Texas, United States   |   Ranger Hill, Texas, United States

Capital costs to install temporary Variable Speed Limit (VSL) systems in Texas ranged from $91K to $180K.

In 2014, acting on a ruling by the Texas Transportation Commission, TxDOT and Texas A&M Transportation Institute (TTI) a Variable Speed Limit (VSL) pilot program was implemented. The pilot…
Content type
System Cost
Made Public Date
05/25/2017
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
San Antonio, Texas, United States   |   Temple, Texas, United States   |   Texas, United States

Pavement friction sensors should target travel lanes instead of shoulder areas where wet pavement can persist causing VSL systems to reduce traffic speeds without need.

Lessons learned during the three month pilot project in Texas included the following: Pavement friction sensors should target travel lanes instead of shoulder areas where wet pavement can persist…
Content type
Lesson
Date Posted
04/07/2017
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
San Antonio, Texas, United States   |   Temple, Texas, United States   |   Ranger, Texas, United States

Variable speed limit pilot found to be effective reducing the number of overall crashes.

Benefits During the variable speed limit pilot in Texas, two safety benefits were observed. Total number of crashes overall was reduced. At two of the three sites there was a reduction in the…
Content type
Benefit
Date Posted
06/26/2016
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
San Antonio, Texas, United States   |   Temple, Texas, United States   |   Ranger, Texas, United States
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