We'll see if the court will hear the case, I had a red-light ticket in Denton where you can see my car stopped behind the line, but my options were to pay $60 or go into arbitration with a company in Arizona. I know from my brief experience working with the City of Denton and general municipalities in OK that independant engineers determine a range for each light (and speed limits) and the local government always takes the value most likely to generate income. So I promise you that 3.1 is within the legally acceptable range.
For the record, the yellow light duration at State School Rd and in Denton is absolutely comical at under 2-seconds in length...much like the 30mph speed limit on Dallas drive which is a 6-lane road with a median at roughly 150' across.



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explaining why a 3.1 second yellow light was not long enough time (per city/state regulations and time/distance to safely stop from 40mph). He said that I made a lot of good points (and he'd never seen anyone so prepared
In order to make more money they make the yellow light too short increasing the chances that people will not be able to stop or stopping very fast causing accidents. 
LOL!

