A "One-Way Street" is a type of road where traffic is allowed to move in only one direction. This design helps to improve traffic flow and reduce the risk of accidents by preventing vehicles from coming head-to-head. Signs are typically posted at the beginning of the street to inform drivers of the one-way rule. One-way streets are commonly found in urban areas, where space is limited and traffic congestion can be a problem. They can also enhance safety for pedestrians and cyclists by reducing the number of conflicting vehicle movements. Cities like New York and San Francisco often utilize one-way streets to manage their busy roadways.