Opponents of the highway argue that it would cause significant environmental impact in an ecologically sensitive area, especially within Banff National Park which is a protected area. They also argue that it would be cost prohibitive constructing the British Columbia section of the highway along the Blaeberry River, especially since the Trans-Canada Highway and the Yellowhead Highway are requiring significant upgrades, and it is a low priority in British Columbia. Howse Pass is also designated as a National Historic Site which further protects the area from development and as a result it is unlikely that the highway will be constructed.