I thought it was basically a big metal detector (you cut the magnetic flux and it 'knows'). As bikes don't have enough metal in them to make it 'know' it just ignores you.

EVen worse when I ride my little 50cc scooter around town... I usually have to wait for a car to pull up behind me at the light, lol!

Quote from sinbad :

I certainly don't think they react to emergency services approaching by switching to green though. It would be safer to just switch all of the lights to red wouldn't it?

That was what i was (trying) to say. All red. Now this is not all over aberdeen. Just the major routes. Its quite funny watching the boulie-bashers (boy racers) trying to stop in time.

But there is one set of lights that puzzle me.

I am a metal head and as a result i wear black (i am not a goth i just like black) and there is a new housing estate been built in Bridge of don (a suburb on the northern outscirts of aberdeen).
These particular ligths are on a small juction beside a single lane (private) bridge.
now the thing i want to know is this: There is no street lights in the area so it get very dark on a cloudy night with no moon. When i walk up to the light, on the pavement, they are red but as i get close they turn green.

so are some light fitted with a small sonar or smething similar???? This has puzzeled me as i dont carry a tourch and dont emit and light. Why do they change for me. This happens evert time I approach them. Any clues?