The road begins four miles west of the Sumas-Abbotsford Border Crossing, and almost reaches the Pacific Ocean 18 miles away. 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 US road ends at the Lynden-Aldergrove Border Crossing. 0 Avenue continues west along the northern border of Peace Arch Historical State Park to Peace Arch Crossing. Small pedestrian bridges cross a trench on the border. At the end of 0 Avenue the road turns north.
The road is a haven for smugglers, even though the border controls have tightened up since the September 11, 2001 terrorist attacks. The first known drug tunnel along the US-Canada border was found east of the Lynden-Aldergrove crossing in 2005.
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