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Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom , the United States , and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
Some mark this fact by using units on various signs. Note that some smaller English-speaking countries in the Caribbean also use miles per hour. Advisory speed limit signs in most countries list units, although New Zealand does not. The US lists units in mph.
In New Zealand, where traffic is on the left, when a road is given a green light from an all-direction stop, a red arrow can continue to display to turning traffic, holding traffic back while a pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).
Road signs in Cuba are very similar to those used in European countries and generally conform to the Vienna Convention on Road Signs and Signals. On September 30, 1977, Cuba acceded to the Convention. Cuba still uses a circular STOP sign, with a triangle inside, which was used in the past in several European countries.
Conventional traffic signal lighting, still common in some areas, uses a standard light bulb. The light then bounces off a mirrored glass or polished aluminium reflector bowl, and out through a polycarbonate plastic or glass signal lens. In some signals, these lenses were cut to include a specific refracting pattern.
Different speed limits exist for heavy goods vehicles (HGV) but the limit for HGV is country dependent: while most Eurasian and American countries might use the Vienna convention's 3.5-tonne limit, other countries in North America, China, India, Australia or Ireland might use different weight limits.
A mysterious light has been blinking in space every 21 minutes for 35 years–and scientists have no idea what it is. What could it be?
This is an accepted version of this page This is the latest accepted revision, reviewed on 30 January 2025. Directionality of traffic flow by jurisdiction Countries by direction of road traffic, c. 2020 Left-hand traffic Right-hand traffic No data Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side and to the right side ...