Traffic Lights Question -

[Bmblbzzz]

Ah, those are what I was referring to as pictogram. But all clear now.

As for level crossings, yes red and amber lights for road traffic are round but there are often red and green, usually rectangular, lights at foot (and cycle, horse etc) crossings. Sometimes there is just a green light with a sign saying not to cross unless green light shows. Often there is nothing. None of these are, AFAIK, compulsory in any way (just pretty sensible to obey them).

[rjb]

Following complaints that the advance cycle lane was not working our councillor rode around to try them out. They worked fine with his steel hack bike but when he tried to repeat it with his carbon steed it often failed to trigger the advanced 5 second start to allow cyclists to set off before the traffic. He managed to get them responding by parking his carbon steed over the central cross with the horizontal aluminium crank over the cross. If it becomes a detection issue then he will press for optical sensors as an addition at this set of lights on a busy junction.
Good on our town councillor to follow this up but a warning to riders with carbon bikes.

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[drossall]

It's a long-standing issue. Even with steel frames, I have found lights where you needed to lie the bike down in the road to get them to change. On several other occasions, I have invited the motorist behind to swap places with me in the queue, to get the car over the sensor, after going through several complete cycles without our direction going green.

[axel_knutt]

It's a long-standing issue. Even with steel frames, I have found lights where you needed to lie the bike down in the road to get them to change.

Where are you positioning the bike?

[drossall]

Where are you positioning the bike?

Over the sensor. Otherwise, it would just be a sit-down protest?

[Bmblbzzz]

The only advance cycle lights we have here are at busy junctions, so there's always other traffic and the advance cycle light just goes green a (too small) number of seconds before the all-traffic one. So first I've heard of there being a detection loop in these! But obviously different places, different systems.

[axel_knutt]

Where are you positioning the bike?

Over the sensor. Otherwise, it would just be a sit-down protest?

The point I was driving at is where on the loop. If you're laying the bike flat, put it over the centre of the loop, but if it's upright it needs to be on the edge of the loop, the centre is a null where it's least sensitive. You need an electrically conductive loop (frame or rim) perpendicular to the flux from the loop in the road.
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