Intersection (road) in the context of "Road transport"

A stop sign is a traffic sign designed to notify drivers that they must come to a complete stop and make sure the intersection (or railroad crossing) is safely clear of vehicles and pedestrians before continuing past the sign. In many countries, the sign is a red octagon with the word STOP, in either English, the national language of that particular country, or both, displayed in white or yellow. The Vienna Convention on Road Signs and Signals also allows an alternative version: a red circle with a red inverted triangle with either a white or yellow background, and a black or dark blue STOP. Some countries may also use other types, such as Japan's inverted red triangle stop sign. Particular regulations regarding appearance, installation, and compliance with the signs vary by some jurisdictions.

Traffic is the movement of vehicles and pedestrians along land routes.

Traffic laws govern and regulate traffic, while rules of the road include traffic laws and 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. (International Regulations for Preventing Collisions at Sea govern the oceans and influence some laws for navigating domestic waters.)

In the field of road transport, an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways, using a system of interconnecting roadways to permit traffic on at least one of the routes to pass through the junction without interruption from crossing traffic streams. It differs from a standard intersection, where roads cross at grade. Interchanges are almost always used when at least one road is a controlled-access highway (freeway) or a limited-access highway (expressway), though they are sometimes used at junctions between surface streets.

In civil engineering (and more specifically, highway or railway engineering), grade separation is a method of aligning a junction of two or more surface transport axes at different heights (grades) so that they will not disrupt the traffic flow on other transit routes when they cross each other. The composition of such transport axes does not have to be uniform; it can consist of a mixture of roads, footpaths, railways, canals, or airport runways. Bridges (or overpasses, also called flyovers), tunnels (or underpasses), or a combination of both can be built at a junction to achieve the needed grade separation.

In North America, a grade-separated junction may be referred to as a grade separation or as an interchange – in contrast with an intersection, at-grade, a diamond crossing or a level crossing, which are not grade-separated.

Traffic lights, traffic signals, or stoplights – also known as robots in South Africa, Zambia, and Namibia – are signalling devices positioned at road intersections, pedestrian crossings, and other locations in order to control the flow of traffic.

Traffic lights usually consist of three signals, transmitting meaningful information to road users through colours and symbols, including arrows and bicycles. The usual traffic light colours are red to stop traffic, amber for traffic change, and green to allow traffic to proceed. These are arranged vertically or horizontally in that order. Although this is internationally standardised, variations in traffic light sequences and laws exist on national and local scales.

The N51 is a road in Luxembourg City, in southern Luxembourg. It is one of the city's main thoroughfares, carrying traffic from Ville Haute, through Kirchberg, to a junction with the A1. For the north-eastern three quarters of its length, on the eastern side of the Alzette, it bears the name Avenue John F. Kennedy. West of the Alzette, it is successively named Boulevard Robert Schuman (after Robert Schuman); Boulevard de la Foire; and Boulevard Grand-Duchesse Charlotte (after Grand Duchess Charlotte).

At its southern end, in south-western Ville Haute, the N51 meets the N4 at an intersection. From here, it heads northwards, followed by northeastwards, skirting the western edge of Ville Haute. After bending almost a full right angle, it crosses the Alzette river, being carried over Pfaffenthal by the Grand Duchess Charlotte Bridge. On the eastern side, it reaches Kirchberg, where it is known as Avenue John Fitzgerald Kennedy, named after United States President John F. Kennedy. The road runs the length of Kirchberg, forming its most important arterial road. It passes several large buildings in Kirchberg, including the Robert Schuman Building, the Philharmonie Luxembourg, d'Coque arena, and the Kinepolis Kirchberg cinema multiplex. Near the city limits, the N51 meets the A1, which carries traffic eastwards, towards Germany.