Are we driving correctly if we drive at less than 45 km/h on this road?
A)Yes, because it is a very narrow road.
B)No, the minimum speed is 45 km/h.Correct
C)Yes, because we are driving at the minimum permitted speed.
Conventional roads have a generic maximum speed of 90 km/h and a minimum of 45 km/h, so it will not be possible to drive at a lower speed than this without justified cause.