I'm guessing that the double yellow in the Chalfont & Latimer photograph is only cleared due to the white light being out. I would expect the signal to be at danger if there were a problem, because a driver is never going to see a little pidldy white light when approaching a signal - we're trained to 'target fix' on the aspect - and 'watch it through' until you're past it, in case the sigggy 'puts back' in an emergency.
Could be wrong though. 
Cheers, John
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"Everything was built by men in overalls and destroyed by men in suits" Fred Dibnah
Last edited by Beeyar Wunby; 15th August 2021 at 19:54.
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