Why are motorcycles allowed in the HOV lanes? Atleast I came up with some statistical data. For a car with four seats, if two are filled (with the occupancy rate of 50%) it is allowed in the HOV lanes. This drops further if the car has five (40%) or even lower for SUVs with 7 or 9 seating capacity. On comparison, a motorcycle will always have a minimum of 50% of the occupancy rate which is higher than any of the cars allowed. Which means, a motorcycle is infact a high occupancy vehicle. QED!