Two lanes in each direction

Where several lanes serve the same direction, heavy traffic may proceed in parallel streams. This does not remove the normal lane-use rules: remain in the appropriate lane through a bend and change lane only for a permitted reason and when safe. Riders of two-wheeled mopeds must not use the left lane merely because traffic is congested. Parallel streams describe traffic conditions; they do not make every lane or every lane change lawful for every vehicle.