motorcycle emergency lighting

The following simple circuit should prove a useful safety aid to motor-cyclists. In contrast to car drivers, motorcyclists generally only have a single head I ight on their vehicle. Thus if it should fail whilst driving at night the motorcyclist is suddenly plunged into darkness and is effecti-vely `blind`, a dangerous state of affairs, to say the least. Normally the motorcyclist would have to fumble for the dipswitch and change over from dipped to full-beam or vice-versa, depending upon which bulb or filament had failed. The circuit described here ensures the safety of the motorcyclist by perfor-ming the task automatically in the event of either bulb (filament) failing.