Miles per hour

Usage

Road traffic

Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions:

• Antigua and Barbuda
• Bahamas
• Belize
• Dominica
• Grenada
• Liberia (occasionally)
• Marshall Islands
• Micronesia
• Palau
• Saint Kitts and Nevis
• Saint Lucia
• Saint Vincent and the Grenadines
• United Kingdom
• The following British Overseas Territories:
  • Anguilla
  • British Virgin Islands
  • British Indian Ocean Territory
  • Cayman Islands
  • Falkland Islands
  • Montserrat
  • Saint Helena, Ascension and Tristan da Cunha
  • Turks and Caicos Islands
• The Crown dependencies:
  • Bailiwick of Guernsey
  • Isle of Man
  • Jersey
• United States
• The following United States overseas dependencies:
  • American Samoa
  • Guam
  • Northern Mariana Islands
  • Puerto Rico
  • United States Virgin Islands

Rail networks

Miles per hour is the unit used on the US, Canadian and Irish rail systems. Miles per hour is also used on British rail systems, excluding trams, some light metro systems, the Channel Tunnel and High Speed 1.

Nautical and aeronautical usage

Nautical and aeronautical applications favour the knot as a common unit of speed. (One knot is one nautical mile per hour, with a nautical mile being exactly 1,852 metres or about 6,076 feet.)

Other usage

In some countries mph may be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball.