A slip lane or slip road is a road traffic lane provided at an intersection to allow vehicles to turn at the intersection without actually entering it and interfering with through traffic. It is therefore not controlled by any traffic signals at that intersection. There are two types of slip lane - those where the lane continues into its own lane in the road which it turns into and those where the lane terminates at the point where it enters the road turned into.
Slip lanes are a dangerous design element, and therefore controversial in urban and suburban contexts - many cities are therefore actively removing them.  Slip lanes may need to be removed if considerations such as pedestrian safety grow to a point where they over-ride the desire to facilitate free passage for cars.
To minimise risks of collision, slip lanes can be shaped to enter the traffic flow at a higher angle than the 45 degrees shown in the first sketch. Such lanes are called high entry angle slip lanes.
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