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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 ...
In contrast, not using the merging lane until the last moment is required by law in Germany, Austria [citation needed] and Belgium; [8] legal use of the lane is when two lanes merge into one and with traffic speed slowed down. Where construction zones close a lane, parts of Canada and the U.S. encourage the "zipper" method of merging, which was ...
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 ...
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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.
A classic instance of this occurs when, from a visibility perspective, it would be safe to drive much faster were it not for a slower-moving vehicle ahead. As such, the dynamic ACDA is governing the basic speed rule, because in maintaining this distance, one cannot drive at a faster speed than that matching the forward vehicle.