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In traffic engineering, a merge is the point where two streams of traffic travelling in the same direction from multiple roads or in multiple lanes on the same road are required to merge into a single lane. A merge may be a permanent road feature, for example at the end of a dual carriageway, or a temporary feature, common during roadworks.
This type of merge is known as a “zipper merge.” In 2019, the N.C. Department of Transportation introduced dynamic zipper merges to help keep traffic flowing smoothly in construction zones ...
An example of a wrong-way concurrency in Oklahoma City, Oklahoma; the wrong-way concurrency is highlighted in red. Since highways in the United States and Canada are usually signed with assigned cardinal directions based on their primary orientation, it is possible for a stretch of roadway shared between two highways to be signed with ...
Regulatory signs give instructions to motorists, pedestrians, and cyclists. Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs.
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The Hotel Indonesia Roundabout in Jakarta, Indonesia A magic roundabout in Kent, UK, on the A13 road near Sadlers Farm. A roundabout, a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.
An acceleration lane or merge lane allows traffic entering a highway to accelerate to the speed of through traffic before merging with it. A deceleration lane is a lane adjacent to the primary road or street used to improve traffic safety [ citation needed ] by allowing drivers to pull out of the through lane and decelerate before turning off a ...