![]() ![]() The late merge operates at a nearly 20 percent higher capacity than a conventional merge. However, it considerably reduces queue ("backup") length (because drivers use the ending lane until its end) and reduces speed differences between the two lanes, increasing safety. The late merge method has not been found to increase throughput (throughput is the number of vehicles that pass through a point in a given period of time). In heavy traffic flow, traffic should therefore queue in both lanes in advance of the merge. Both streams should create alternating gaps into which vehicles from the other stream can merge at the merge point. The late merge method dictates that both streams of traffic should continue to drive up to the point of closure, and merge at the marked taper. Late merge A 'Queue in both lanes' sign instructs drivers to use both lanes up to the merge point Zipper method road signage in Warsaw For example, in the US state of Indiana, a dynamic no-passing zone is created in advance of the merge, to ensure drivers can move into the open lane before reaching the end of a queue. Ī dynamic merge strategy involves advance notices for a variable distance from the lane closure. This method may reduce the chance for rear-end collisions by warning drivers of the closure in advance of congestion. Ī static early merge strategy involves the placement of advance notices for a fixed distance in advance of the lane closure. Strictly speaking an early merge is different from a conventional merging method, in that the traffic is encouraged to merge well in advance of the merge point. To encourage drivers to merge early, authorities may employ a static or dynamic early merge strategy. The early merge method dictates that one stream of traffic will maintain priority over another at the merge, and therefore traffic in the other lane should merge at the first opportunity. Early merge A variable message sign warning drivers of a lane closure on the M25 At some slip roads, traffic continues into a new lane (a "lane gain") and therefore does not need to merge. Generally speaking, at a slip road onto a controlled-access highway or otherwise, traffic on the highway has priority over traffic joining at the slip road, and therefore the slip road traffic should accelerate to the speed on the major road and merge into a gap in the stream of traffic in lane one. 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.Ī merge may be a permanent road feature, for example at the end of a dual carriageway, or a temporary feature, common during roadworks. For other uses of the term "merge", see Merge (disambiguation).
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