The Missouri Department of Transportation will soon be installing new chevron signs and arrow boards around curves in the northeast corner of the state. Rob Frese, MoDOT traffic operations engineer, said around 1,000 signs will be installed in many counties including Ralls, Pike and Lincoln by December of 2018.
"One of the best ways to prevent injuries and fatalities is to keep people on the road, and these additions will help improve safety by warning motorists of curves," said Frese.
A chevron is a yellow and black sign shaped like the pointed end of an arrow. An arrow board is rectangular with a full arrow.
Not all curves are alike, so in order for a curve to qualify for these chevron signs and arrow boards, a few requirements must be met.
"The route must have an annual average daily traffic count of at least 1,000 vehicles and the advisory speed must be 15 mph below the posted speed limit. For example, on a 55 mph posted speed limit roadway, curves with an advisory speed plaque of 40 mph or less qualify for chevrons, 30 mph or less for arrow boards," Frese said.
He explained that most smaller, numbered roads do not meet the traffic volume requirement and reminds motorists that the speed on all state highways is 55 mph unless otherwise posted. However, if a curve is tested and found to have an advisory speed limit of 30 mph or less, then it is then treated as a turn and given a sign. In most cases with a turn sign, MoDOT installs two arrow boards, four if it is a reverse turn, and even more if it is a winding road with multiple turns.
"If a curve has had a multitude of crashes, we will install chevron signs and may lower the advisory speed to help better prepare drivers for the curve," Frese added.
To report a potentially dangerous curve, Missourians are encouraged to call MoDOT’s customer service number at 1-888-275-6636.