The Coquitlam – Cape Horn is comprised of the 4 km stretch of Highway 1 between King Edward Street and the west end of the Port Mann Bridge.   Improvements to this area includes highway widening, reconstruction of the Brunette interchange, construction of a new King Edward Street overpass across Highway 1 and reconstruction of the Cape Horn interchange (a multi-stage process with 15 new structures).

The Cape Horn Interchange area is one of the busiest interchanges along the Highway 1 corridor. It provides access to Highway 1, the Port Mann Bridge and Lougheed Highway, with traffic connecting to the northeast sector as well as downtown Vancouver and other communities west of the bridge.

Improvements to the Cape Horn Interchange will address congestion on Highway 1 by improving traffic flow between the major arterial roads, improve safety by reducing traffic weaving and designing ramps to accommodate commercial vehicles. With the new design, the number of interchange structures (overpasses and underpasses) will increase from four to 15 to assist in providing direct connections between Highway 1 and major arterial roads.​