In the state of Texas yellow lights last depending on the speed limit of the road. It's 1 second to every 10 MPH.
Say the speed limit is 45 miles per hour, then your yellow light will be 4.5 seconds long. If the speed limit is 75, then the light will be 7.5 seconds long.
It depends on where you live. In miami it is about 4 seconds, but it depends on how many lanes the road is, how many roads are merging into the intersection, what the speed limit is, what time of day it is, what day it is, etc etc etc.
i wanted a more accurate answer??
Like a minute or somthin