Highway 4 (AKA the Pacific Rim Highway west of Port Alberni, British Columbia and Alberni Highway to the east) is the longest east-west land route on Vancouver Island, spanning a total of 163km. It goes from Qualicum Beach to Tofino.
Highway 4 starts at an intersection with Highway 19A in Qualicum Beach, and immediately heads south 2km to an interchange with Highway 19. Just south of this, the highway meets a junction with Highway 4A in Coombs.
The highway travels west from here to Cameron Lake. It travels along the shore of Cameron Lake for about 5km, then goes through MacMillan Provincial Park to Port Alberni. I exits Port Alberni to the west, crossing over the Somass River.
Just west of Somass River, Highway 4 will arrive at the shore of Sproat Lake, and then follow it west. It then goes through Sutton Pass, and turns to the southwest. It continues in this direction to Kennedy Lake, then follows the shore southwest to Ucluelet. The highway then turns 90 degrees to the northwest, through Pacific Rim National Park, and then ends in Tofino.