From the Highway Code (adjacent to a depiction of the lights most commonly used at railway crossings):
Flashing red lights
Alternately flashing red lights mean YOU MUST STOP
At level crossings, lifting bridges, airfields, fire stations, etc.
That takes care of traffic, and it would be reasonable to assume this also applies to pedestrians.
Mister B
Last edited by HTB; 7th Jul 2014 at 12:39.
Reason: c & p formatting