What is the required number of turn signal lamps in the back of a vehicle?

The requirement for the number of turn signal lamps at the back of a vehicle is two. This standard is in place to ensure visibility and safety while turning or changing lanes. Having two turn signal lamps allows other drivers to clearly see the vehicle's intention to turn and provides a backup signal in case one lamp fails. This redundancy helps reduce the chances of confusion or accidents on the road.

Different vehicle configurations may vary in design, but for standard vehicles, having two functioning turn signal lamps is critical for compliance with safety regulations. This requirement enhances safety by ensuring that the signal is sufficiently visible to other road users from various angles and distances.