Green River Star -

WYDOT tries variable speed limit plan


November 3, 2022

CHEYENNE (WNE) — The Wyoming Department of Transportation on Wednesday announced an “innovative” pilot program to semi-automate variable speed limit signs this winter.

Typically, VSL changes are prompted by WYDOT and Wyoming Highway Patrol personnel driving on that section of highway, based on specific criteria like weather conditions, according to the Wednesday news release. 

The new automated program uses data from WYDOT sensors to adjust the speed indicated on the VSLs when employees may not be in the area to initiate the changes themselves. This results in quicker changes, which can match how quickly conditions change on highways. 

“The automation still has a human component,” said Vince Garcia, WYDOT Intelligent Transportation Systems program manager, in the written statement. “Speed limit changes prompted by the program can be adjusted or even vetoed by a boots-on-the-ground employee like a trooper or highway maintainer.” 

For example, if sensors indicate traffic can resume normal interstate speeds, but there is an active crash investigation and cleanup in the area, troopers can hold the lower speed to protect first responders and keep the traveling public safe. 

The program will start with two sections of VSLs: one located along Interstate 80 between Laramie and Rawlins, and another on Wyoming Highway 28 over South Pass. 

If the program is successful, it can be expanded to other VSLs around the state. 

WYDOT reminded drivers that the speed indicated on the VSLs is the legal speed limit. Motorists should always drive according to current conditions and be ready to adjust speeds in case of changing road and weather conditions. 

Road conditions, VSL information and more can be found on the Wyoming 511 tools at and the Wyoming 511 app.


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