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.
Boulevard Périphérique (French pronunciation: [bulvaʁ peʁifeʁik]) is a controlled-access dual-carriageway ring road in Paris, France. One of the busiest roads in Europe, the Périphérique is the generally accepted boundary between the city of Paris proper and its suburbs. With a few exceptions (see Structure and Layout), it is situated along Paris's administrative limit.
The speed limit is 80 km/h (50 mph). Each ring generally has four traffic lanes, with no hard shoulder. At junctions, circulating traffic in the rightmost lane (separated from the other lanes at this point by a continuous white line to the left) must yield priority to entering vehicles.
When travelling at the legal speed limit, it takes around 26 minutes to complete a full circuit.