Hand Signals for Driving: What They Are and How to Use Them. If all else fails, an arm out the window can keep you safe if you know the signals. William Irvin Lewis Writer Dec 16, 2023.

The program for the yellow arrow left-hand traffic signal began in 2013 with an installation in Lenox. The state had to get permission from the federal government due to make the change.

Bicyclists must signal their intent by either hand to stop or turn. However, the signal does not have to be continuous or be made at all if both hands are needed for the bicycle’s safe operation.