What's up with the flashing yellow arrows? MoDOT explains

Recent changes at several area intersections will result in fewer accidents and improve traffic flow, according to the Missouri Department of Transportation.

Beginning in 2016, MoDOT has added "flashing yellow arrows" to highway intersection signals at nine locations in Cape Girardeau County. The additional flashing arrows are designed to give drivers more opportunities to turn left at signalized intersections instead of waiting for a solid green arrow to turn.

"Studies have shown that flashing yellow arrows actually reduce accidents," said Jake Butler, senior traffic studies specialist with MoDOT.

"In the last three years, we've added flashing yellow left-turn arrows at nine highway intersections in the Cape, Jackson and Fruitland areas," Butler said, "and we're looking at additional locations where they can benefit motorists."

The most recent installation of a flashing yellow arrow signal was several weeks ago in Jackson at the intersection of School Lane and Missouri Highway 25.

"By using the flashing yellow arrow during off-peak times, traffic on Missouri 25 will see fewer red lights and improved traffic flow," Butler said.

Flashing yellow left-turn arrows mean left turns at signalized intersections are allowed once drivers yield to oncoming traffic and pedestrians.

The new lights are designed "to promote safety more than anything," Butler said and explained they're being installed at "suitable locations where there is adequate sight distance and where a vehicle turning left can do so safely while the yellow arrow is flashing."

Missouri is one of several states that have begun adding flashing yellow left turn arrows at signalized intersections.

"We expect the new signals to become the preferred signal display for left turns," according to a statement from MoDOT. "A national study conducted for the Federal Highway Administration demonstrated (they) help prevent crashes, move more traffic through intersections and provide additional traffic management flexibility."

"Across the state, we have had great success with flashing yellow arrows," Butler said. "Motorists appreciate the increased efficiency and eased congestion."

In addition to the new flashing arrows, additional signs have been added next to the new signals telling drivers they must "yield on flashing arrow."

More information about flashing yellow left turn arrows and about traffic signals in general can be found on the MoDOT website, www.modot.org.

jwolz@semissourian.com

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