Driving a car overtaking cars must overtake on the right, except in cases when a vehicle being overtaken are junction, turn right, or whether a right turn signal. So riders can overtake on the left side.
Driving overtake the vehicle in front to overtake on the right. Except when overtaking a car is turning right. Or to signal that it will turn right. The driver can overtake on the left hand.
Driving overtake the front to overtake on the right hand side. Except in the case when the car to be overtaking is right. Or signal to turn right. The driver was able to overtake on the left.