Vehicle to be driven on part of road between centre and left-hand edge of road
3.  Every vehicle shall ordinarily be driven on that part of a road which lies between the centre thereof and the left-hand edge of the road way; and shall, when overtaking any vehicle, except in those cases specifically referred to in these Rules, only do so in such manner as to leave the vehicle overtaken on its left or near side and to avoid causing inconvenience or danger to any person or other vehicle.