<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> One - way traffic (or uni-directional traffic) is traffic that moves in a single direction . A one - way street is a street either facilitating only one - way traffic, or designed to direct vehicles to move in one direction . One - way streets typically result in higher traffic flow as drivers may avoid encountering oncoming traffic or turns through oncoming traffic . Residents may dislike one - way streets due to the circuitous route required to get to a specific destination, and the potential for higher speeds adversely affecting pedestrian safety . Some studies even challenge the original motivation for one - way streets, in that the circuitous routes negate the claimed higher speeds . </P> <P> Signs are posted showing which direction the vehicles can move in: commonly an upward arrow, or on a T junction where the main road is one - way, an arrow to the left or right . At the end of the street through which vehicles may not enter, a prohibitory traffic sign "Do Not Enter", "Wrong Way", or "No Entry" sign is posted, e.g. with that text, or a round red sign with a white horizontal bar . Sometimes one portion of a street is one - way, another portion two - way . An advantage of one - way streets is that drivers do not have to watch for vehicles coming in the opposite direction on this type of street . </P>

Turning left from a one-way road to another one-way road