Sending a clear signal: Flashing yellow arrow means yield before turning left

February 24, 2012

A new type of traffic control device featuring a flashing yellow arrow is an increasingly common sight at signalized intersections in Wisconsin and should send a clear signal to drivers: A left turn is permitted, but you must first yield to oncoming traffic and pedestrians.

The four-head traffic signals first started showing up in Wisconsin about a year ago in response to new federal rules. The signals are typically installed in conjunction with roadway improvement projects at intersections meeting certain criteria. A decade-long national study by the Federal Highway Administration found the flashing yellow arrows help reduce driver confusion.

"The goal of these new signals is to provide a more direct, less-confusing message to motorists when turning left," said Joanna Bush with the Wisconsin Department of Transportation's (WisDOT) Bureau of Traffic Operations. "As with anything new, there's a period of public education and adjustment, but the bottom line is enhancing intersection safety."

The new signals feature a green arrow which means a driver has the right-of-way to make a left turn. When the signal cycles to the flashing yellow arrow, it means a driver may turn left if there is no oncoming traffic and there are no pedestrians crossing the street. A solid yellow arrow means drivers should be prepared to stop. As usual, the top-positioned red arrow tells drivers they must stop and wait. The signals typically include an adjoining, static sign that reads: "Left turn – yield on flashing yellow arrow."

The four-head arrow signals also provide traffic engineers with more options as the timing sequence can be adjusted as traffic volumes vary throughout the day. More information on the flashing yellow signals including a video demonstration can be found on the WisDOT Web site.

For more information, contact:
Joanna Bush, WisDOT Bureau of Traffic Operations
(608) 261-5845, joanna.bush@dot.wi.gov