The past few months have been a highly unusual time as people sheltered in place to prevent the spread of COVID-19. Schools, streets and stadiums fell silent, tourist hot spots became ghost towns, and sidewalk traffic largely ...
Social Sciences
Aug 06, 2020
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5
When cells experience a high level of stress—for example, when they are exposed to too much UV light—ribosomes inside the cell collide and get into traffic jams. Now, Johns Hopkins scientists have found a protein that ...
Cell & Microbiology
Aug 05, 2020
0
120
A tailored layer of plasmonic nanoparticles can be introduced into the epoxy casing of a light-emitting diode (LED) to improve the device's light output, to benefit energy savings and boost the LED lifetime. In a new report ...
Introducing the newly designed 'meta-grid' of nanoparticles into the epoxy casing of light-emitting diodes (LEDs) offers a substantial improvement of their light output, besides increasing lifetime, according to the scientists ...
Optics & Photonics
Jul 29, 2020
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11
Current regulations on air pollution mainly focus on the mass of particles of a particular size range in a sample, and this has been used as a marker for their threat to human health. But these air quality standards do not ...
Environment
Jul 28, 2020
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Airborne microplastics from traffic pollution may be entering the world's oceans at a similar rate to that from rivers, according to new research Tuesday warning that the particles may also speed up Arctic ice melt.
Environment
Jul 14, 2020
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14
When Europeans retreated into their homes to observe strict stay-at-home rules to contain the coronavirus, dolphins and whales on the Mediterranean coast basked and thrived in a hitherto unknown calm.
Ecology
Jul 14, 2020
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17
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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