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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 countries use European-style white-on-blue circular signs. These are "Type A Mandatory Signs" as prescribed by the Vienna Convention. Some Latin American and Caribbean countries use red-bordered circular signs, in the same style as regulatory signs. These are "Type B Mandatory Signs" as prescribed by the Vienna Convention.
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.
All modern roads and railways are measured, built and signposted in the metric system. All the imperial speed limit signs were replaced within 3 days in 25 August 1984 to 27 August 1984 upon enactment of new traffic law, with a temporary territory-wide speed limit of 50 km/h in force within that 3 days, while all remaining road signs were gradually replaced within the following 3 years.
The original 1 ⁄ 4 inch (6.35 mm) phone connector jack dates back to 1878 [54] [55] [56] and still sees use in audio equipment and electric instruments. In many respects, it has been superseded by the 3.5 mm connectors or 2.5 mm headset, which was common on older mobile phones. [57]
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The road sign for a 30 km/h zone in Austria The road sign for a 20 mph zone in the UK. 30 km/h zones (30 kilometres per hour zones) and the similar 20 mph zones (20 miles per hour zones) are forms of speed management used across areas of urban roads in some jurisdictions. The nominal maximum speed limits in these zones are 30 kilometres per ...
The Light Locomotives on Highways (Ireland) Order 1896 then set a maximum national speed limit of 12 mph (19 km/h) with a speed limit of 6 mph (9.7 km/h) for traffic in villages, towns and the Dublin Metropolitan Police District. Vehicles weighing more than 2 tons (unladen) were restricted to 5 mph (8.0 km/h) in these areas.