The alert is given by a warning lamp which
comes on in the door mirror on the side in
question as soon as a vehicle - car, lorry,
cycle - is detected.
For this, the following conditions must be met:
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all the vehicles must be moving in the
same direction,
the speed of your vehicle is between 7 and
75 mph (12 and 140 km/h),
when you overtake a vehicle with a speed
difference of less than 6 mph (10 km/h),
when a vehicle overtakes you with a speed
difference of less than 15 mph (25 km/h),
the traffic must be flowing normally,
in the case of an overtaking manoeuvre,
if this is prolonged and the vehicle being
overtaken remains in the blind spot,
you are driving on a straight or slightly
curved road,
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No alert will be given in the following situations:
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when overtaking (or being overtaken by) a
very long vehicle (lorry, coach...) which is
at the same time detected at the rear in the
blind spot angle and present in the driver's
forward field of vision,
in very heavy traffic: vehicles detected in
front and behind are confused with a lorry
or a stationary object,
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in the presence of immobile objects
(parked vehicles, barriers, street lamps,
road signs...),
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with vehicles moving in the opposite
direction,
driving on a sinuous road or a sharp
corner,
your vehicle is not pulling a trailer, a
caravan...
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when overtaking quickly.