Trucks manufactured prior to which year are required to have at least one tail-light?

Trucks that were manufactured prior to 1960 are required to have at least one tail-light due to safety regulations aimed at ensuring visibility for vehicles on the road. This requirement was established to enhance the safety of both the vehicle and other road users by providing better identification of the vehicle's presence, especially in low light conditions or at night.

The year 1960 serves as a critical point in the evolution of vehicle safety standards. Vehicles manufactured after this date generally follow updated regulations that were more stringent and aimed at improving overall road safety. Tail-lights are essential for signaling the actions of a vehicle to those behind it, reducing the chances of accidents.

The other years mentioned, while relevant in the history of vehicle regulations, do not encompass the broader requirements laid out for vehicles produced up until 1960, which marked a time when various safety standards were being revised and implemented more rigorously. This context helps clarify why the correct answer is linked to the year 1960 and not to earlier years.