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An average span between street lights approximately equals stopping distance of an average car at an average speed, which, in turn, equals 3 seconds, and most drivers consider signalling change of direction for 3 seconds a sufficient warning to others. 3 seconds equal 5 ticks of the turn indicator.
Ref.#3
p.2 states you should signal 30 metres before you turn or pull over.
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This
ternary check ensures good observation. You look out, on the one hand, for
pedestrians and animals in close vicinity on your left – you can move over
only when there is none, and on the other hand, for vehicles that would
be forced to slow down to drive round you if you change lanes – you should
give them way. With the rest of the vehicles you can go ahead. Practically,
you can ignore vehicles farther than 1 light pole span from you.
You
check the left blind spot by looking into the both left-side windows, and to
see the rear of the left blind spot you have to look over the left shoulder
into the rear door window; overall, checking the blind spot should take less
than half a second. If you are head-checking blind spot for too long you may
drift out of the line of traffic.
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