Driving off, without the "off"
The words "stop" and "proceed" were used for what is considered the first automated traffic signal, and the Wikipedia article about traffic lights talks about traffic "proceeding" through the intersection.
So perhaps your checkbox could be labelled something like "delay proceeding on green" (or "...from green"), or just "delay proceeding".
"[ ] driver hesitation" is another way to think about it, and could also apply to entering roundabouts or proceeding through stop signs.