SafeSpeed wrote:
I'm worried about red light cameras. We have to look at the different reasons that folk go across on the red.
Type 1: Never sees the red light, or sees it too late to react to it.
Type 2: Recklessly ignores the red light...
...Types 1 and 2 are highly dangerous, yet are not affected by red light cameras.
I'm either playing devil's advocate or being a picky sod, you decide

, but I'm not sure I'd say unaffected either. Isn't it more accurate to say that they were not put off by the presence of the camera the first time,
but they'll still get a ticket from the camera. That may affect them for next time, though of course some of the problems with speeds cams could then apply as well (distraction by camera at lighted junctions? overcaution?). In any event, that's all assuming that it's (a) their car and (b) the registration details are okay. Given your post about ANPR I recognise that may not always be the case, and anyway there's likely to be a significant number of Type 2 drivers that recklessly ignore the lights because the car's nicked.

SafeSpeed wrote:
Type 3: Goes through early in the red phase having misjudged the lights changing (the amber gambler)
I think that's the type that the BBC article I linked to in the OP was on about. If the numbers of type 3 are on the rise, and I'm inclined to believe they are, then they're the ones that worry me.
SafeSpeed wrote:
Type 4: Treats the red light as a give way, and goes when he thinks it is clear to do so.
Types 3 and 4 may be caught by red light cameras, but then they were not dangerous and if amber gamblers are a problem then an all red phase will make the situation safe at a particular junction.
I'm not convinced that Type 3 isn't dangerous. By definition they have misjudged the timing of the lights and therefore may not anticipate traffic coming from the side if another amber gambler has gone early on his amber. Also, as I mentioned before you have the guy who floors it to try and get across on amber and fails to consider that the car in front of him may intend to stop for the light.
What do you mean by an all red phase? Do you mean no amber lights or do you mean a period of a few seconds when all approaches to junction show red lights? The latter sounds like a good idea as it wouldn't require any changes to be made to existing lights other than some re-programming at the places where it's needed.
SafeSpeed wrote:
Changing the length of the amber is a very bad idea - we need to know how long it is in order to judge if we can brake or not. All UK Ambers are 3 seconds.
Here's the article,
http://www.techcentralstation.com/020602C.html, relevant section begins about 1/4 the way down.
Quote:
Last summer, a study conducted in Fairfax County, Virginia, home to cameras operated and profited by Lockheed Martin, found that simply increasing the "yellow" time at a given intersection by 1.5 seconds dropped red-light infractions by 96%, significantly more than the decrease effected by installing cameras.
Yeah, I'm not convinced either, though perhaps not for the same reasons. I think that eventually drivers will adjust to any change and we're back to where we are now. It might possibly work if a way could be found to get all drivers to treat ambers correctly, but then if you could do that you wouldn't need to make the amber phase longer.
