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Flashing lights (such as strobe lights) or rapidly changing or alternating images (as in clubs, around emergency vehicles, near overhead fans, in action movies or television programs, etc.) are examples of patterns in time that can trigger seizures, and these are the most common triggers. Static spatial patterns such as stripes and squares may ...
In 2010, HardingTest.com was launched to provide users with a way of testing video remotely, without the need to have an in-house Harding FPA machine. This provided a much-needed service for freelance editors and production companies who previously had to export their movie to video tape to send to a larger post-production facility for testing, all of which increased time and expense.
These warning signs indicate that traffic lights are ahead, and are often used when it is difficult to see that a traffic light may already be showing red, to warn a driver to prepare to slow down. They may be supplemented with flashing light or lighted sign when light is red or turning red.
Flashing beacons are flashing signals. Yellow flashing beacons are usually used to draw attention to other traffic control devices, such as a crosswalk sign. Red flashing beacons are used to supplement stop signs. Steady burning electric lamps work similarly to flashing electric lights except that its yellow lights are not flashing.
In the US, a single-aspect flashing amber signal can be used to raise attention to a warning sign and a single-aspect flashing red signal can be used to raise attention to a "stop", "do not enter", or "wrong way" sign. [32] Flashing red or amber lights, known as intersection control beacons, are used to reinforce stop signs at intersections. [33]
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.
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The basic signal consists of flashing red lights, a crossbuck and an alarm (either a bell, a speaker that mimics a bell sound or an electronic siren), attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so ...
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