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[78bex]

Are there any national set limits for traffic lights to change from green to red 

Following another car today, I saw one 40 mph board, the road in front widened into seperate lanes with traffic lights in the distance. As we approached the traffic lights, the car in front safely passed thru on a green light. as he did so the light went to amber so I braked & came to swift halt as the light changed to red. The bloke behind wasn`t happy & I got verbals & the finger. The route I was travelling was unfamilar to me.  but that amber light was really short before it changed to red. I reviewed the timing on my dashcam footage it was just under 3 seconds from the start of amber to the red light. I`m no mathmetician but I was about 2 seconds behind the bloke in front. If I had continued then I would have passed thru the junction on a red towing a saxo. My speed was about 30 mph & the traffic wasn`t too heavy. How far was I from those lights when the amber came on? In other words how far did I travel in 2 seconds at a speed of  30mph. Or did I over-react to the lights changing.  The old girl pulled up nice & square & the brakes feel strong following a complete change of the brake fluid. 

[AndyRoid]

In other words how far did I travel in 2 seconds at a speed of  30mph.

Approx 88 feet (27 metres if you don't understand imperial).

[albitz]

Some of the lights "down that London" barely go to green long enough to allow a single car through.

[cem_devecioglu]

traffic light timings must be variable based on daily+hourly statistics.. and it really is a science..
 
however, mostly arranged with fix timings by incompetent workers

[Taxi_Driver]

There are a couple of roads in Swindon that have cameras fitted before traffic lights junctions. If you  are going too fast, they change the lights to red on purpose. There are no signs to say what the cameras are for and its pretty obvious sometimes that some drivers dont realise that the lights will change to red on them! 

[Shackeng]

There are a couple of roads in Swindon that have cameras fitted before traffic lights junctions. If you  are going too fast, they change the lights to red on purpose. There are no signs to say what the cameras are for and its pretty obvious sometimes that some drivers dont realise that the lights will change to red on them! 

Which ones are those? Not that I exceed the limit.

[05omegav6]

Some of the lights "down that London" barely go to green long enough to allow a single car through.

Nothing to do with red light and box junction revenue then

[Taxi_Driver]

There are a couple of roads in Swindon that have cameras fitted before traffic lights junctions. If you  are going too fast, they change the lights to red on purpose. There are no signs to say what the cameras are for and its pretty obvious sometimes that some drivers dont realise that the lights will change to red on them! 

Which ones are those? Not that I exceed the limit.

One set in Queens drive as you approach the junction of Whitbourne Av......from Coate.

Another set on Thamesdown Drive as you approach the 1st Oakhurst entrance from Taw Hill 

[Shackeng]

There are a couple of roads in Swindon that have cameras fitted before traffic lights junctions. If you  are going too fast, they change the lights to red on purpose. There are no signs to say what the cameras are for and its pretty obvious sometimes that some drivers dont realise that the lights will change to red on them! 

Which ones are those? Not that I exceed the limit.

One set in Queens drive as you approach the junction of Whitbourne Av......from Coate.

Another set on Thamesdown Drive as you approach the 1st Oakhurst entrance from Taw Hill 

I use Queen's Drive so I'll look for that one.

[78bex]

In other words how far did I travel in 2 seconds at a speed of  30mph.

Approx 88 feet (27 metres if you don't understand imperial).

ok  so just looked-up the safe stopping distance in the dry @ 30 mph & it comes to  23 metres. So the 3 second amber light gives just enough time to brake & stop. But not enough time to react & stop at 40 mph (36 metres) & no chance to stop at 50 mph (53 metres).