<P> The simplest traffic light comprises either a single or a pair of coloured aspects that warns any user of the shared right of way of a possible conflict or danger . </P> <Ul> <Li> Flashing red: treated as a stop sign . This can also signal the road is closed . In France and the United Kingdom, flashing red mandates absolute stop, at the crossing of a railway line, an airport strip, or a swing bridge . </Li> <Li> Flashing yellow: caution, crossing or road hazard ahead . </Li> <Li> Flashing green: varies among jurisdiction . Flashing green can give permission to go straight as well as make a left turn in front of opposing traffic (which is stopped by a steady red light), can indicate the end of a green cycle before the light changes to a solid yellow, or (as in British Columbia, Canada, or Mexico City, Mexico) indicates the intersection is a pedestrian crosswalk . In Greece, flashing green lights cannot be found . Instead, dual flashing orange lights are used . </Li> </Ul> <Li> Flashing red: treated as a stop sign . This can also signal the road is closed . In France and the United Kingdom, flashing red mandates absolute stop, at the crossing of a railway line, an airport strip, or a swing bridge . </Li> <Li> Flashing yellow: caution, crossing or road hazard ahead . </Li>

Where might you find a single flashing red light in france