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<p>Published research identifies that flashing lights at certain intensities have
the potential to trigger seizures in those who suffer from photosensitive epilepsy.
It also reports the likelihood of such effects to be low and the frequency range most
likely to cause such a response is 5-30 flashes per second (5-30Hz).</p><p> </p><p>As
such, the Road Vehicles Lighting Regulations 1989 (as amended) permit flashing bicycle
lamps only if they have a frequency of no greater than 4 Hz, and not so bright as
to cause undue dazzle or discomfort to other road users.</p><p> </p><p>Enforcement
of road traffic law is generally an operational matter for individual Police Forces
and their Officers can issue verbal warnings, fixed penalty notices or report riders
for formal prosecution.</p>
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