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Lovebirds ace maneuvers in the dark

While pilots rely on radio signals, advanced computations and tools to keep them on course during strong crosswinds, birds can naturally navigate these demanding conditions—and do so in environments with little visibility. ...

Ridehailing services may be driving up traffic deaths

While the era of app-based ridehailing services, such as Uber and Lyft, has been credited with keeping more impaired drivers off the road, increasing job opportunities and offering new levels of convenience, it is also linked ...

Tel Aviv takes a ride to scooter 'paradise'

Matan Ben Ari was among the many taking to one of Tel Aviv's main streets on a recent day—not with a car or public transport, but with an electric scooter.

Using mobile phone data to estimate air pollution exposure

Air pollution is one of the greatest challenges cities are facing today, and improving air quality is a pressing need to reduce negative health impacts. In order to efficiently evaluate which are the most appropriate policies ...

Slashing plane emissions a lofty goal, but progress elusive

The aircraft industry is facing growing criticism over greenhouse gas emissions that are set to soar as more people take to the skies, but experts say game-changing technology for cleaner planes is still decades away.

Medical drones for accident and emergency

Remote or computer-controlled aircraft, commonly referred to as "drones" could revolutionize the way in which emergency medical supplies, such as bags of blood plasma, are delivered to areas hit by disaster, accidents or ...

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Traffic

Traffic on roads may consist of pedestrians, ridden or herded animals, vehicles, streetcars and other conveyances, either singly or together, while using the public way for purposes of travel. Traffic laws are the laws which govern traffic and regulate vehicles, while rules of the road are both the laws and the informal rules that may have developed over time to facilitate the orderly and timely flow of traffic.

Organized traffic generally has well-established priorities, lanes, right-of-way, and traffic control at intersections.

Traffic is formally organized in many jurisdictions, with marked lanes, junctions, intersections, interchanges, traffic signals, or signs. Traffic is often classified by type: heavy motor vehicle (e.g., car, truck); other vehicle (e.g., moped, bicycle); and pedestrian. Different classes may share speed limits and easement, or may be segregated. Some jurisdictions may have very detailed and complex rules of the road while others rely more on drivers' common sense and willingness to cooperate.

Organization typically produces a better combination of travel safety and efficiency. 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 jams and gridlock. Simulations of organized traffic frequently involve queuing theory, stochastic processes and equations of mathematical physics applied to traffic flow.

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