Not true. What the COMPANY running the cameras AND the city traffic lights did was shorten the yellow to get more revenue. They were on a percentage of the fines. They had stupid stuff like two second or less yellows on 45 MPH roads, and 1 second yellows on 35 MPH roads. Given that it takes the average human at least 0.5 seconds to react to anything new, there was no way they could stop if they were only running at the speed limit (as if

). If memory serves this BS took place in Phoenix or Tuscon in the last ten years. I would Google it and post a link but I am taking no chances with this copyright BS.
Sorry Steve. It will not wash. Get a MUTCD (Manual of Uniform Traffic Devices) and read some. Lights can not even be used to control speed in an area. The formulas for light timing, sequence and lenght is complex and set by law.
If you can prove the times for yellow signals were reduced for cameras, then get an attorney, sue the city and both you and the attorney will become millionnires. It would be simple to do. Just get a copy of the TSI for an intersection for the time before cameras and get one for a date after the cameras were installed. If the light sequence shortened the yellow or did not allow for an all red (traffic for all directions getting a red) then you have your evidence. You can then get awarded damages for driver/pedestrian peril, violation of law (all states adopted the laws contained in MUTCD) and disregard for public safety.
So now for a brief course in traffic engineering. Anything, including cars, move at 1.4666 feet per second per mile per hour. A car moving at 40 miles per hour will basically be travelling at 60 feet per second. The avg person will be able to perceive and react in .75 seconds. Then their reaction starts a chain of events such as braking, be it panic or casual.
If an area has a 40mph speed limit and the driver is doing the speed limit when they see a light go yellow, then they must decide if they have time to stop without being in the intersection when halted or if they can clear the intersection before receiving a red light. Their speed is 60 feet per second, they get a yellow 100 feet from the intersection. They travel 45 feet before applying the brakes. Then it will take them, depending on road friction, type braking, weight distribution of the vehicle and other things, about 75 feet to stop. So now they are stopped in the middle of an intersection and that creates more of a problem.
But the cross streets may be four lanes of 12 feet each and then the driver may be driving a full size auto (17 feet). Therefore the yellow will be set for a car to enter and clear the 48 feet of lanes and allow for a 17 foot long car to clear while making the speed limit.
So seeing a yellow with perception / reaction time from 100 feet prior to the intersection, added to the clearance distance for the intersection, the usual speed (not mph limit) for the area and a few other things tossed in, the yellow will have to last 2.75 seconds.
The problem is I see people having accidents when the light went yellow at a time when they were 200 feet from the intersection so they speed up to make adjustments for the light but get hit due to not having time to clear the intersection. They sue the city saying the light was too short for them to clear the intersection and they lose.
People have perceptions. If you see someone in a Corvette, you perceive them one way, in a Cadillac another, in a beat up truck another and all without knowing them. The same perceptions can be in clothing or many other things. Traffic signals are no different. Many people fail to understand the elements that go into setting times for lights. They also fail to understand that we can determine speed prior to braking as well as at time of crash. So they perceive light sequences to be shortened for whatever reason be it the motorcycle officer sitting in the shade at the intersection or the cameras on the poles just waiting to write them a ticket. People are resistent to change. They continue what they did prior to cameras and they get caught but they blame a perception that the signal was shortened just to give them a ticket.
Also, once the TSI has been written does not stop the monitoring. If we see a lot of accidents at an intersection, we know there is a problem there and we find out why so we can correct it. We also look for changes such as speed limit changes, road construction, lane changes, visibility restrictions and many other things.
When there is a major accident involving a death, people are ready to sue the city for taffic signal problems. We have to stay on top of the issue and adhere to the rules set forth in the MUTCD.
The yellow sequence was not shortened but your perception of it creates the idea it was.