Peter Sarf
Established Member
This really sums up what I am trying to say. A flashing red is going to require more interpretation than the regularly encountered steady red. Even a driver very familiar with the highway code is going to do a double take at a flashing red (unless they see them often) whereas a steady red is so common its purpose invokes a deep seated instinct - STOP. That means a risk - not sure for how long but it is a risk. And of course a more common flashing amber is not a simple stop so there is no similarity to the logic.Quite likely a flashing light is easier to detect, but once that light is detected there is then a further step, where the person then has to interpret what that flashing light means and what their response should be.
A typical road driver encounters a steady red light so frequently that their response is automatic, there's no uncertainty. Encountering flashing red wig-wags is much rarer, it can be years or decades between drivers seeing them flashing and needing to respond, hence there is not the same continual reinforcement and automatic response. It doesn't help that on the roads when flashing lights are used, the most common situation is a flashing amber, which means either caution hazard or caution and stop if you can see a pedestrian crossing but otherwise proceed with caution.
The other issue, is the absence of a permissive green light on the wig-wags, to draw attention to their presence on approach and to emphasis that the permission to proceed has been removed, as it changes from green, to amber, to flashing red.
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