Interstate 270 Variable Advisory Speed Sign Change

Last week, the Missouri Department of Transportation (MoDOT) on Interstate 270. Changes began June 10 that made the variable speed limit signs on I-270 advisory only. The signs were changed to indicate 60 mph all the time.  

This week the crews are changing the sign around the digital board to be an advisory yellow with black lettering.  The words will change to say, "Advisory Speed When Flashing."

The signs were put in place three years ago, but their impact on traffic congestion was minimal, a study determined. The signs did cut down on accidents along the interstate though, making it the safest highway in the St. Louis metro area,

The changes were announced in March.

Advisory speed limits will not be enforced, but are instead meant for safety. They will display speeds from the 60-mph limit, to 10 mph, depending on the amount of traffic. 

"The advisory speed limit is similar to having advisory speed limit signs posted on curves and ramps," said Tom Blair, Missouri Department of Transportation assistant district engineer. "It is the suggested speed to safely travel that stretch of road."

Two portions of the interstate won't have the same speed limit as the rest of the highway. Southbound I-270, between Dorsett Road and Page Avenue, along with northbound I-270, between Gravois Avenue and Interstate 44, will have a 45-mph speed limit. Both of those areas are in around-the-clock work zones.

Patch contributor contributed to this report.