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Photosensitive epilepsy (PSE) is a form of epilepsy in which seizures are triggered by visual stimuli that form patterns in time or space, such as flashing lights, bold, regular patterns, or regular moving patterns. PSE affects approximately one in 4,000 people (5% of those with epilepsy).
Some warning signs have flashing lights to alert drivers of conditions ahead or remind drivers to slow down. In Britain , they are called warning lights . Flashing lights can be dangerous for people with certain forms of epilepsy and/or sensory processing disorder .
Red lights supplement stop signs on the side road approaches. All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by US regulations. In Canada a flashing yellow light at an intersection that would otherwise have traffic signals indicates that the traffic signals are malfunctioning.
In the United States, a single emergency vehicle blocking a right-of-way could have as many as eight warning lights flashing 75 times per minute with different colors and levels of intensity, as well as different flash patterns and synchronization. Alaska, Arizona, Colorado, Minnesota, and Nebraska also use blue lights on snowplows. [99] [100 ...
Emergency signal - stop on flashing red. R10-14a Emergency signal - stop on flashing red (overhead) R10-14b ... Push button for warning lights - wait for gap in traffic.
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