[3] The road begins near the Peace Arch Border Crossing, and continues eastward for 28.9 kilometres (18.0 mi), with gaps around the Pacific Highway and Lynden–Aldergrove Border Crossings.

Boundary Road on the US side runs for 1.5 miles along 0 Avenue and again one mile to the west, with many cameras watching the border, before the U.S. road ends at the Lynden–Aldergrove Border Crossing.

At the eastern end of 0 Avenue, the road turns north.

[2] The road is used by smugglers, even though the border controls have tightened up since the September 11 attacks.

[4] The first known drug tunnel along the Canada–United States border was found east of the Lynden–Aldergrove crossing in 2005.