What maximum speed can you ride a moped past this sign, if you’re transporting a five-year-old child?

The D-40 'Residential zone' sign indicates entry into an area where a speed limit of 20 km/h applies to all vehicles. Although regulations limit the speed of a moped carrying a child up to the age of 7 to 40 km/h, in this situation the lower, stricter limit indicated by the sign must be adhered to.