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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.
These signs indicate when a multilane highway is being narrowed, when a passing lane is ending, or where the road is widening or a passing lane starting. Another type of sign is used to indicate central "two-way" left turning lane in center of roadway. Warning signs may also warn of "Highway ends", where the road changes class or type.
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 ...
Drivers who wait until their lane ends to merge at the last minute may seem rude when they’re jumping ahead of other drivers waiting in line, but studies show that the maneuver can help improve ...
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. Some have special shapes, such as the octagon for the Stop sign, the triangle for the Yield sign, and the crossbuck for railroad crossings.
Broken lines that are wider and closer together than regular broken lines are called continuity lines. Continuity lines on the left side of a lane denote that the lane is about to end and that motorists must soon merge left. Continuity lines on the right mean that the lane will continue, but traffic may merge into it ahead. [27]
After demerging from right-turning traffic, they complete their left turn by crossing both highways on a flyover ramp or underpass. The penultimate step is a merge with the right-turn on-ramp traffic from the opposite quadrant of the interchange. Finally, an on-ramp merges both streams of incoming traffic into the left-bound highway.
The left lane is commonly referred to as the "fast lane", but that is not an accurate description of the lane's purpose. The left lane is the designated passing lane; however, vehicles in the left lane must obey the posted speed limits. A common problem arising from misuse of the left lane is speeding and tailgating.