Tom Handley wrote:

>    I've been at an intersection on a motorcycle where the light would not
> change unless a vehicle was over the buried loop. .SNIP...... When I
> finally noticed the loop, I walked
> my cycle over it a couple of times to get the light to change...
>

Yeah, the ones around Melbourne are also buried in the bitumen. One across
the 'straight ahead' lanes and one in the 'right turn
lane' in cases where there's a red\green arrow. (Opposite to US practice, we
drive on the left.). You can tell from the scars where the surface has been
cut.

At intersections fitted with a 'red light camera' there's a sensor loop in
the middle of the intersection to bag red-light runners. Trouble is, they
also bag the poor saps who get stuck in the middle doing a right turn when it
goes amber.

Jus' wondering again .... what would the system would do if a car stopped
over one of the loops had  it's own loop mounted
underneath that was fed current pulses? Maybe look like a massive traffic
flow against the red light?

PJH