I-270 Advisory Speeds Begin Today

The Missouri Department of Transportation (MoDOT) will post variable advisory speeds on Interstate 270 and Interstate 255 to warn drivers of slowed traffic on those highways.

"Starting today, (July 5) the digital speed signs will display flashing advisory speeds whenever traffic ahead is slowed to between 55 mph and 10 mph," MoDOT Assistant District Engineer Tom Blair said. "The purpose is to advise drivers of congestion ahead. You need to slow down, pay attention and prepare to reduce speed."

Advisory speed limits are not enforceable, MoDOT said in the news release.

"We are advising drivers of how fast or slow their vehicle should be moving in order to safely get to their destination in the shortest amount of time," Blair said. "The advisory speed signs are similar to the black-on-yellow advisory speed signs posted on curves and ramps. It is the suggested speed to safely travel that stretch of road."

Variable advisory speeds are designed ease traffic prior to rush hour congestion or from congestion caused by closed lanes due to a crash or work zone.

If drivers ignore the advisory speeds and hurry to the point of the congestion, they create more congestion, MoDOT said. 

When drivers obey the advisory speeds, the overall pace of traffic will get through the congested area more quickly.