km/hIreland
An introduction to the traffic rules and road signs of Ireland. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.
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101. km/h
km/h means kilometres per hour and is a unit used to measure speed. It expresses how many kilometres a vehicle or other moving object would travel in one hour if it maintained the same speed.
For example, a speed of 50 km/h means travelling at a rate of 50 kilometres per hour. Kilometres per hour are widely used for road speeds and speed limits in countries that use the metric system.
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What does km/h mean?
km/h is the abbreviation for kilometres per hour, a unit used to measure speed.
What does 50 km/h mean?
A speed of 50 km/h means that, if the speed remained constant, the vehicle would travel 50 kilometres in one hour.
Is km/h the same as mph?
No. km/h measures speed in kilometres per hour, while mph measures speed in miles per hour. The two units therefore represent different numerical speeds.

Traffic rules
Ireland