N20 2 Plus 1 Rathduff:

A 2 plus 1 Road consists of two lanes in one direction of travel and one lane in the opposite direction. The two-lane section, which provides a safe overtaking zone, alternates with a one-lane section at intervals of 2km approximately. The traffic streams are separated by a safety barrier system, which prevents overtaking manoeuvres on the one-lane section. Right turning movements will be at controlled junctions and a reduction of head on collisions is anticipated.