re: Red light cameras

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I am unaware of vehicle detection tech that is currently available to do this

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It is VERY easy to detect, both with cameras and radar, whether a vehicle is decelerating, and by how much, with current tech. This has been possible for a couple decades, at least. Problem is, preventing people from running lights isn't profitable.

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Applying James Cameron-type ideas doesn't mean they are possible....at least not currently.

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You serious? All you have to do is detect speed and distance. It is absolutely trivial to detect a possible light-runner far in advance with minimal equipment. Your car probably already alerts you if it detects a possible collision. Why is this so far-fetched?

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Naïve is you thinking the field of Traffic Engineering has snazzy ideas for everything.

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Attempting to reduce accidents is a snazzy idea, eh? Hey, you know how RR crossings flash lights, make a noise, and lower barriers when a train is coming? What a snazzy idea!

This whole argument is absurd. Of course the technology exists! Radar works by line of sight, so it knows how fast you're going from hundreds of feet away all the way to the intersection. And there are multiple ways to detect range, from sensors across the road (these are everywhere counting traffic), to beam breaks, to optically via the camera. It is dead simple to detect possible light runners hundreds of feet in advance, with decades-old tech. It is similarly easy to take appropriate action in response to these situations. There is absolutely no reason whatsoever that these intersections with cameras couldn't also prevent cross traffic green, flash the red rapidly, and sound an alarm to get a driver's attention in plenty of time for them to react. Well, except that it's not profitable to prevent people from running a light.