Side appropriate to the direction of traffic

means a carriageway or a part thereof designated for vehicular traffic in one direction. In the event of a two-way carriageway, the right part of the carriageway bordered by a traffic control device on the left or, in its absence, by the imaginary centre-line, is deemed to be the side appropriate to the direction of traffic. Where the tracks of a tramway are located in the middle of a carriageway and they are at grade with it, the centre-line of the tracks of the tramway is deemed to separate the two sides of the direction of traffic. A tramway appropriate to the direction of traffic belongs to the side appropriate to the direction of traffic. On a two-way carriageway that has three lanes marked with road surface markings in its overall width, only the rightmost lane is the side appropriate to the direction of traffic, unless provided otherwiseby a traffic control device. Where a road has a separate lane for public transport vehicles or slow-moving, heavy or other vehicles that are not rail vehicles or rail-borne vehicles, the edge of this separate lane closest to the carriageway is the edge of the side appropriate to the direction of traffic for other trackless vehicles.