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Time lapse video of traffic congestion near HaShalom interchange in Highway 20, Israel. Traffic congestion occurs when a volume of traffic generates demand for space greater than the available street capacity; this point is commonly termed saturation. Several specific circumstances can cause or aggravate congestion; most of them reduce the ...
Gridlock on a network of two-way streets. The red cars are those causing the gridlock by stopping in the middle of the intersection. Gridlock is a form of traffic congestion where continuous queues of vehicles block an entire network of intersecting streets, bringing traffic in all directions to a complete standstill.
Events which disrupt the flow and may cause traffic to degenerate into a disorganized mess include road construction, collisions, and debris in the roadway. On particularly busy freeways, a minor disruption may persist in a phenomenon known as traffic waves. A complete breakdown of organization may result in traffic congestion and gridlock.
While speed bumps may slow down traffic, they can also lead to congestion and increased travel times. This can be particularly problematic on busy streets or during emergency situations.
In transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control devices), with the aim of understanding and developing an optimal transport network with efficient movement of traffic and minimal traffic congestion problems.
Congestion can often throw off any coordination, however. On the other hand, some traffic signals are coordinated to prevent drivers from encountering a long string of green lights. This practice discourages high volumes of traffic by inducing delay yet preventing congestion or to discourage use of a particular road.
"The traffic on the Westlink and the Sydenham bypass is bad, even going onto the Boucher Road and Lisburn Road is bad, so it's far easier to not contribute to as much congestion by getting the ...
Such signs warn of traffic congestion, accidents, incidents such as terrorist attacks, AMBER/Silver/Blue Alerts, roadwork zones, or speed limits on a specific highway segment. In urban areas , VMS are used within parking guidance and information systems to guide drivers to available car parking spaces.