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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.
In traffic flow theory, the Newell–Daganzo merge model describes a simple procedure on how to determine the flows exiting two branch roadways and merging to flow through a single roadway. The model is simple in that it does not consider the actual merging process between vehicles as the two branch roadways come together.
See three-way junction 5-1-1 A transportation and traffic information telephone hotline in some regions of the United States and Canada that was initially designated for road weather information. A Access road See frontage road Advisory speed limit A speed recommendation by a governing body. All-way stop or four-way stop An intersection system where traffic approaching it from all directions ...
A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), [1] [2] is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the interchange so that traffic crossing the freeway on the overpass or underpass is operating on the ...
For cars and motorcycles candidates are asked 50 questions in 57 minutes and the pass mark is 43 out of 50. For lorries and buses, there are 100 questions in 115 minutes and the pass mark is 85 out of 100. The hazard perception test is the second part of the driving theory test. Both parts must be passed in order to pass the theory test.
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 February 2025. Directionality of traffic flow by jurisdiction Countries by direction of road traffic, c. 2020 Left-hand traffic Right-hand traffic No data Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side or to the right side ...
A high-occupancy vehicle lane on Interstate 5 in Seattle. A high-occupancy vehicle lane (also known as an HOV lane, carpool lane, diamond lane, 2+ lane, and transit lane or T2 or T3 lanes) is a restricted traffic lane reserved for the exclusive use of vehicles with a driver and at least one passenger, including carpools, vanpools, and transit buses.
A driving test generally consists of one or two parts: the practical test (sometimes called a road test in the United States), used to assess a person's driving ability under normal operating conditions, [1] and a theory test (written, oral or computerized) to confirm a person's knowledge of driving and relevant rules and laws.