| 摘要 |
<p>A vehicle speedometer lights up with a colour which depends on the speed, as do lights on front and rear of the vehicle, and passenger lights within e.g. buses. Speed limit signposts, traffic control lights, painted road markings and cat's-eyes indicate speed limit by their colour. The speed limit traffic control lights may be combined with fog and accident warnings and may be programmed from police handsets or traffic cameras.</p> |
