Flashing yellow left-turn arrows have been around Dubuque since 2014 but remember, a FLASHING YELLOW ARROW means you must yield to oncoming traffic and pedestrians; then turn left, proceeding with caution. (Oncoming traffic has a green light.)
The attached graphic shows the two types of left-turn signal heads being used in Dubuque and a reminder of what each arrow means. You can also view or download this information at the following link:
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The U.S. Federal Highway Administration adopted the flashing yellow arrow as a national standard for permissive left-turn operations in 2012. The flashing yellow left-turn arrow is intended to:
- Help prevent crashes. A national study demonstrated that drivers found flashing yellow left-turn arrows more understandable than traditional yield-on-green indications.
- Reduce traffic delays. There are more opportunities to make a left turn with the flashing yellow left-turn arrow than with the traditional three-arrow, red, yellow and green indications. This helps reduce delays at intersections, which save time and fuel.
- Provide more traffic management flexibility. These traffic signals provide traffic engineers with more options to handle variable traffic volumes.
Source: Iowa Dept. of Transportation
