When must attachments have additional lighting systems?

The requirement for attachments to have additional lighting systems is established to ensure safety on the road. Each selected choice addresses a specific safety concern:

1. When an attachment blocks the vehicle's lighting system, it can prevent the normal operation of lights like brake lights or turn signals, endangering visibility and communication with other road users.

2. If an attachment projects more than 40 cm laterally beyond the vehicle's front and rear position lamps, it extends the vehicle's width beyond typical limits, which could create confusion and potential hazards, especially in narrow conditions or when making turns.

3. When an attachment projects by more than 1 meter beyond the vehicle's retro-reflectors, it can create a blind spot for other drivers and reduce the attachment's visibility, especially at night or in low-light conditions.

By requiring additional lighting in these situations, German traffic laws aim to minimize accidents and improve overall road safety. All these criteria must be considered collectively to ensure comprehensive safety measures for vehicles with attachments.