A detour is an alternate route that directs traffic around a road closure, construction zone, or other obstruction. When municipalities close roads for maintenance, construction, special events, or emergencies, they establish signed detour routes to maintain traffic flow and access to properties. Planning effective detours requires considering traffic volumes, road capacity, intersection controls, pedestrian and cyclist needs, transit routes, and impacts on adjacent neighbourhoods. Poor detour planning can create gridlock, safety hazards, or unfair burdens on residential streets. Municipalities typically notify residents before planned detours through signage, websites, and media. Emergency detours for accidents or sudden road failures require rapid coordination between traffic operations, police, and public communications. Extended construction projects may maintain detours for months or even years.