Following on from David Cowie's message. . .
Seems that might be the only way I can get the light to change ! How
about a foil vest 
Bit annoying waiting at the light (for it to change) knowing that
there's no way to activate a sensor and wait for a car to approach
before it'll change.
They are _speed_ sensitive with a cut-off at about 15mph. Complain to
the appropriate highway authority who should be able to tweak it to
cotton on to your approach..
gone are the days of laying a bike down in the road over the sensor 
--
PETER FOX Not the same since the pancake business flopped
2 Tees Close, Witham, Essex.
Gravity beer in Essex http://www.eminent.demon.co.uk