Variable Speed Limits (VSL) cut crash rates by more than half during low visibility on I-77 in Virginia. Findings 1. Crash rates during low visibility were less than one-half of pre-VSL activation crash rates. Although based on limited data, it is a positive early indication that the system is having… Content type Benefit Date Posted 12/26/2018 Taxonomy (ARC-IT) Variable Speed Limits (TM20) Geolocation links Fancy Gap, Virginia, United States