Yellow light intervals are established under engineering standards, not legal standards. The yellow interval is a function of the posted speed of the roadway, the location of the stop bar on the pavement relative to the signal heads, and the sight distance for motorists approaching the light.
Thank you for the thoughtful reply.
We have an intersection near us with a red green yellow stoplight and two 55 mph roads. One of the roads is a gentle curve coming up to it. I hate rounding the curve and seeing that stale green light because the yellow is short and causes me to either brake hard or jump on the gas. numerous fatal accidents over the years. Do you think all 55 mph roads have the same length yellow?