A detour, or deviation, refers to a change in the usual route taken to reach a destination. This can occur due to various reasons, such as road construction, accidents, or natural obstacles. Detours are often marked with signs to guide drivers and pedestrians along alternative paths until the original route is accessible again. In navigation, detours can also apply to other contexts, such as public transportation or hiking trails. They help ensure safety and maintain flow, allowing travelers to continue their journey despite unexpected interruptions. Understanding detours is essential for effective planning and travel management.