S.L. 65.11 ст. 75Driving on left side.

Every person driving a motor vehicle shall keep to the left hand side of the road and, when overtaking any other vehicle, horse or cattle, shall keep his vehicle on the right hand side of such vehicle, horse or cattle except in traffic lanes expressly marked on the carriageway for such purposes and within the limitations of such markings, or for other just cause.

When altering direction or course, or slowing down or stopping, or when overtaking any other vehicle, horse or cattle, every driver shall exercise due care and attention, and shall indicate his intention by hand signal or by a traffic indicator or indicator light.