Vehicle lighting systems are very important, particularly where road safety
is concerned. If headlights were suddenly to fail at night and at high speed,
the result could be catastrophic. Many techniques have been used, ranging
from automatic changeover circuits to thermal circuit breakers, which pulse
the lights rather than putting them out as a blown fuse would. Modern wiring
systems fuse each bulb lament separately and even if the main supply to the
headlights failed, it is likely that dim-dip would still work.
We have come a long way since lights such as the Lucas ‘King ...
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