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  2. 30 km/h zone - Wikipedia

    en.wikipedia.org/wiki/30_km/h_zone

    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 ...

  3. Built-up area (Highway Code) - Wikipedia

    en.wikipedia.org/wiki/Built-up_area_(Highway_Code)

    In the UK Highway Code for England, Scotland and Northern Ireland, a built-up area is a settled area in which the speed limit of a road is automatically 30 mph (48 km/h). In Wales it's 20 mph (32 km/h). These roads are known as 'restricted roads' and are identified by the presence of street lights.

  4. Miles per hour - Wikipedia

    en.wikipedia.org/wiki/Miles_per_hour

    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.

  5. Speed limit - Wikipedia

    en.wikipedia.org/wiki/Speed_limit

    Research in 1998 showed that the reduction of some 30 mph (48 km/h) United Kingdom speed limits to 20 mph (32 km/h) had achieved only a 1 mph (1.6 km/h) drop in speeds and no discernible reduction in accidents; 20 mph (32 km/h) speed limit zones, which use self-enforcing traffic calming, achieved average speed reductions of 10 mph (16 km/h ...

  6. Speed limits in the United States by jurisdiction - Wikipedia

    en.wikipedia.org/wiki/Speed_limits_in_the_United...

    15 mph (24 km/h) in a school zone within 30 minutes of the beginning or end of the school day or whenever/wherever children are present; 20 mph (32 km/h) near an intersection "when the operator's view is obstructed", unless right-of-way is given via signage; 25 mph (40 km/h) in business or residential districts, or other built-up areas

  7. Speed limits in Ireland - Wikipedia

    en.wikipedia.org/wiki/Speed_limits_in_Ireland

    This replaced the 50 mph (80 km/h) speed limit in all but a few cases where regulations had been drafted specifically to impose a 50 mph (80 km/h) limit. While the built up area and special speed limits were clearly indicated to motorists by the number 30, 40 or 50 in black numbers on a white circular background with a red outline, there was no ...

  8. Units of measurement in transportation - Wikipedia

    en.wikipedia.org/wiki/Units_of_measurement_in...

    kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey; the international statute mile (mi) is used in the US; 1 mi = 1.609344 km; nautical mile is rarely used to derive units of transportation quantity.

  9. Kilometres per hour - Wikipedia

    en.wikipedia.org/wiki/Kilometres_per_hour

    Speed limit sign in the Republic of Ireland, using "km/h.". The SI representations, classified as symbols, are "km/h", "km h −1" and "km·h −1".Several other abbreviations of "kilometres per hour" have been used since the term was introduced and many are still in use today; for example, dictionaries list "kph", [3] [4] [5] "kmph" and "km/hr" [6] as English abbreviations.