Do they use km or mph in Australia?

Understanding Australia’s Speed Limit Signage: Kilometers per Hour (km/h)

Australia has a standardized system of speed limits that are universally displayed in kilometers per hour (km/h). This metrication was implemented in 1974 as part of a broader conversion to the metric system.

All speed limit signs in Australia, with the exception of South Australian school and roadwork zones, follow a consistent pattern. These signs typically feature multiples of ten, ending in zero. For example, common speed limits include 50 km/h, 80 km/h, and 110 km/h.

The use of km/h as the standard unit of speed ensures consistency and clarity throughout the country. This ensures that drivers can easily understand and comply with the posted speed limits, regardless of where they are driving in Australia.

South Australian Exception

South Australia has a unique exception to the national speed limit signage system. In this state, speed limits in school and roadwork zones are displayed in 25 km/h increments, rather than multiples of ten. This measure was introduced to enhance safety and visibility in these areas.

International Comparison

While Australia uses km/h for speed limits, many other countries use miles per hour (mph). This includes the United States, the United Kingdom, and Canada. The use of different units of speed can be confusing for drivers traveling internationally, so it’s important to be aware of the local speed limit signage conventions when traveling abroad.

Conclusion

Australia’s universal use of km/h for speed limits ensures clarity and consistency. By adhering to the posted speed limits, drivers can contribute to road safety and reduce the likelihood of accidents.