Section 39. Overtaking a Vehicle. —

The driver of any motor vehicle overtaking another vehicle proceeding in the same direction shall pass at a safe distance to the left thereof, and shall not again drive to the right side of the highway until safely clear of such overtaken vehicle except that on a highway, within a business or residential district, having two or more lanes for the movement of traffic in one direction, the driver of a vehicle may overtake and pass another vehicle on the right. Nothing in this section shall be construed to prohibit a driver overtaking and passing, upon the right, another vehicle which is making or about to make a left turn.