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Kilometres per hour (km/h) is a unit of speed expressing the number of kilometres travelled in one hour. Learn about its history, abbreviations, unit symbols and conversions to other units of measure.
Metre per second (m/s) is the SI unit of speed and velocity, equal to one metre per second. Learn how to convert m/s to other units, such as km/h, mph, kn, and ft/s, and the history and symbol of m/s.
As of May 15, 2017, 41 states have maximum speed limits of 70 mph (113 km/h) or higher. 18 of those states have 75 miles per hour (121 km/h) speed limits or higher, while 7 states of that same portion have 80 mph (129 km/h) speed limits, with Texas even having an 85 miles per hour (137 km/h) speed limit on one of its toll roads.
An arterial road is a road without controlled access that can carry a large volume of local traffic at a generally high speed, being below controlled-access highways in the hierarchy. Learn more about the road hierarchy, its functions, capacities, and examples from different countries.
Velocity is the speed and direction of motion of an object, measured in metres per second (m/s) in SI units. Learn how to calculate average and instantaneous velocity, the difference between speed and velocity, and the relationship to acceleration.
A comprehensive table of speed limits for different types of roads and vehicles in various countries and regions. Learn about the definitions, enforcement tolerances, and exceptions for urban and rural areas.
Speed is the rate at which an object covers distance, while velocity is the rate with direction. Learn how to calculate speed, the difference between average and instantaneous speed, and the units of speed in various contexts.
Highway agencies use IRI thresholds to characterize road condition; for example, in the United States, an IRI of less than 95 in/mi (1.50 m/km) is generally considered by the Federal Highway Administration to be in "good" condition, an IRI from 96 to 170 in/mi (1.51 to 2.68 m/km) is considered "acceptable", and an IRI exceeding 170 in/mile (2. ...