About Indicating, brake lights and hazard lights: which statement is correct?
You always indicate about 30 metres, or roughly 3 seconds, before the turn — that is THE rule of thumb.
Once you know the right distance for indicating, that one distance applies on every road — motorway, provincial road or village street, it makes no difference.
Only to avert imminent danger may you give an acoustic or light signal.
Inside the built-up area you indicate only at the very last moment, just before you steer in.
Explanation
trap: signal without its danger condition. Book p.183 - only to avert imminent danger may you give an acoustic or light signal. Alerting others to your presence without danger is not covered by that