​Signals

As well as getting information IN (about what's around you), you should give information OUT (about what you intend to do).

Do this by signalling, usually with lights on your car.  Timing matters, to avoid confusion, and not alarm others very close. ​ Use arm-signals if lights don't work.  Both will warn others of your intention to …

1.  Turn  (by flashing AMBER direction indicators), or reposition
2.  Slow  (by rear RED lights; automatic when using footbrake)
3.  Reverse  (by rear WHITE lights; auto. when in reverse gear)
4.  Be a hazard  (by ALL direction indicators flashing AMBER)
5.  "Be there"  (by horn / flashing headlights, if you're not noticed)

Know what others' signals mean for your own plan.  And, whenever you see a flashing signal, think of the lighthouse.