Motorcycles may pass on the right:

Motorcyclists may pass on the right if there is unobstructed pavement with a width of at least eight feet to the right of the vehicle being passed. Motorcyclists, and other drivers, should never leave the road to pass another vehicle.

• If there is at least eight feet of unobstructed pavement.
• By riding on the shoulder of the road.
• By riding on the grass, if it is level.