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re: Red light cameras
Posted on 5/13/19 at 5:23 pm to CharlesLSU
Posted on 5/13/19 at 5:23 pm to CharlesLSU
quote:Why do you act like the math is so difficult? If you know the speed and distance of a vehicle (and acceleration rate if you take multiple measurements), it is not difficult at all to calculate the probability of it stopping in time. Hell, in most cases all you need to know is simply whether or not the vehicle is decelerating at a distance of about 2-300 feet from the intersection.
red light runners HUNDREDS OF FEET in advance?!?! Outside of doing 100+mph, how in the hell are you going to determine a red light running vehicle?!
quote:This is amazing. Are you or any of your peers working on ways to actually reduce traffic accidents?!
I am a licensed PE specializing in Traffic Engineering...
quote:How so? This seems to be the easiest scenario to make a life-saving adjustment to the signals. Even if people do tend to proceed after a too-long all-red, not everyone does. If your options are give cross traffic a green KNOWING there is a vehicle approaching too quickly, or extend the all-red on the assumption that most people won't proceed, which is preferable?
And, you miss to boat on how it would be used to control cars already under ALL-RED conditions.
quote:
As far as Advance Vehicle Detection (what you are so knowledgeable of)
quote:Well, at least you are aware that there are multiple existing technologies to detect the presence, location, and velocity of a vehicle.
it is typically accomplished with inductive loops, radar, microwave, or video.
quote:Good, good.
This advanced vehicle detection is utilized to extend green times as need to ensure an advancing vehicle has adequate time/space to stop under a clearance indication (i.e. yellow light).
quote:You don't need a "clear determination". All you need is a probability in order to take appropriate action. Even if altering the cross traffic light's timing is out of the question for whatever absurd reason you come up with, at the very least the possible runner could be alerted visually and/or audibly.
What is NOT feasible due to the operating dynamics (and driver habits) is a clear determination of a "red light runner"
quote:Wonderful. Do you have any statistics on whether reducing the all-red time would actually be beneficial when it is know to be safe to do so?
However, in implementing the 2second ALL-RED interval does mitigate this exact circumstance....going beyond the 2seconds is wasted/useless tech and/or extending a time frame that is already proven hazardous.
quote:Same to you.
Dude. WTF?
quote:So who causes most collisions? Vehicles approaching under yellow (where I assume most collisions are prevented by the all-red, as I hinted at on page 2), or dumbasses cruising through a red?
ETA: The red light violations we are discussing are related to thpose vehicles approaching under a yellow and trying to proceed.....NOT a dumbass approaching the intersection under a red ball. Your logic is more aligned with that than the issue at hand.
My argument is simply that red light cameras used to mail citations are mildly beneficial to public safety at best, basically a wash in most cases, and slightly harmful at worst. Meanwhile private companies and some departments are raking in loads of cash under the guise of improving public safety. Further, I argue that these systems could easily instead be integrated into the traffic control system to actually improve safety with little to no downside, but it doesn't happen because it's not profitable.
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