Commuters not heeding high tech speed limit signs

Researchers say Twin Cities commuters are contributing to traffic jams on I-35W, by ignoring high tech advisory speed limit signs designed to ease congestion.
That is among the findings of a comprehensive study of congestion along the I-35W corridor, by the Intelligent Transportation Systems Institute headed by a group of University of Minnesota engineers.
The signs are part of the smart lane technology built into a 16-mile stretch of the interstate, from Burnsville to Minneapolis. They were installed over the past three years with the use of federal anti-congestion grants.