What is the maximum speed you may drive with a combination of vehicles which consists of a truck and two trailers with overrun brakes?

With a combination of a truck and two trailers, if the trailers are equipped only with overrun brakes (meaning they do not have full service brakes), you are limited to a maximum speed of 25 km/h according to German traffic regulations. This rule exists because longer combinations with this brake type have a much longer stopping distance and less stability at higher speeds. Always remember: combinations like this are much slower on public roads for safety reasons. Knowing this helps you remember that special speed limits apply to certain vehicle combinations, especially when older or less effective braking systems are involved.