Horrocks Engineers recently performed the concept development and final design for the I-80 Parley’s Canyon Variable Speed Limit project in Utah. The project resulted in 15 new variable speed limit signs on I-80 which are used to adjust the speed limit of the corridor to better suit current roadway conditions.
Horrocks researched various technologies available on the market, including type of signs, and worked with UDOT to decide on a preferred sign type. Each sign is connected to the existing fiber optic network and remotely controlled from UDOT’s Traffic Operations Center. Additionally, Horrocks identified the preferred locations of the signs. The signs are placed strategically throughout the corridor to create specific speed zones depending on terrain and roadway geometry. The speed limit can be set uniquely according to the conditions within each zone.
The design and concept for the project lasted over one year. Construction was completed at the end of October 2013 and the signs went live on January 8, 2014. This project is the first of its kind in Utah. If it proves successful, UDOT will consider implementing it on other corridors as well.
The project was recently featured in a KSL article, which can be found at: