Blaine is home to two main West Coast ports of entry between the United States and Canada. The Peace Arch Border Crossing, which is the northern terminus of I-5 and southern terminus of B.C. provincial Highway 99, serves as the primary passenger vehicle port of entry. The Pacific Highway Border Crossing, approximately one mile to the east, serves as the primary point of entry for heavy truck traffic, and thus is also known as the Truck Crossing. The latter is reached via Washington State Route 543 which departs I-5 on the south side of Blaine and connects at the border to B.C.'s Highway 15 (Surrey's 176th Street) and then to the Trans-Canada Highway.