The operation of vehicles is prohibited if:

Explanation

Both the absence of a first-aid kit in the car and the fitting of reversing lamps showing red light.

This question places one item from the "mandatory equipment" category alongside one from the "lamp colours" category, and both are on the list of prohibiting defects.

A first-aid kit is mandatory equipment in every car. The logic is time: in road collisions, the interval between the incident and the ambulance's arrival is often precisely the window in which heavy bleeding becomes fatal. A bandage and a tourniquet in the hands of the first driver on the scene achieve what no advanced equipment can make up for later.

The colour of reversing lamps has an explicit rule too: it must be white. White light at the rear of a vehicle has a defined meaning — "this vehicle is backing up". If a red lamp is fitted instead, the driver behind mistakes it for a tail or brake light and does not realise the car in front is moving towards him; the result is car-park bumps and reversing collisions. Beyond that, red light facing rearwards is reserved for signalling "the end of the vehicle", and adding an extra red source disrupts others' reading of the vehicle's state at night.

The short rule: at the rear only red (except reversing and number-plate lamps, which are white), and never red at the front.

• Correct but incomplete; the absence of a first-aid kit really does prohibit operation, but the option sets aside the reversing lamp colour item. • A red reversing lamp is independently an offence too, but choosing it alone makes the answer incomplete.

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