In the cities of Edmonton and Calgary, rush hour typically lasts from 7–9 am and begins again at 2:30–6 pm. The overwhelming traffic causes significant delays on freeways and commuter routes, most notably being Anthony Henday Drive in Edmonton, where the province has committed to widening, and Deerfoot Trail in Calgary. Edmonton's Whitemud Drive and Yellowhead Trail are also notable as the busiest freeways after the Anthony Henday Drive (Yellowhead being only about 75% freeway, although construction is ongoing until completion), whereas Calgary's Crowchild Trail and under-construction Stoney Trail are the busiest after Deerfoot. Both cities and Alberta are working on ways to improve traffic flow such as widening, interchange improvements, and collector-distributor systems being proposed for the Anthony Henday Drive and Stoney Trail, respectively.