Even if you increase the all-red time, shorter yellows are still more dangerous. For example if you drop the yellow time too low for the legal speed limit of t

Even if you increase the all-red time, shorter yellows are still more dangerous. For example if you drop the yellow time too low for the legal speed limit of the road then you will create a situation where people have to start emergency braking in order to avoid running the red. This situation is unsafe for obvious reasons.