page_title: Speed limits in Australia
section_title: Historical limits
hierarchical_section_title: Speed limits in Australia / Historical limits
caption_attribution_description: English: A remnant Australian pre-metric 15 MPH speed limit sign
context_page_description: Speed limits in Australia range from 5 kilometres per hour shared zones to 130 kilometres per hour. In the Northern Territory four highways have 130 kilometres per hour zones. Speed limit signage is in km/h since metrication on 1 July 1974. All speed limits are multiples of 10 km/h – the last digit in all speed signs is zero. Speed limits are set by state and territory legislation albeit with co-ordination and discussion between governments.
context_section_description: Historically, Australia operated a simple speed limit system of urban and rural default limits, denoted in miles per hour. As part of metrication in 1974, speed limits and speed advisories were converted into kilometres per hour, rounded to the nearest 10 km/h, leading to small discrepancies in speed limits. Signage changed from a North American-style black and white textual sign to a design based on metric signage in use in New Zealand with black number in red annulus (or circle) on white, itself a derivative of the European standard number in red circle design.
caption: A remnant pre-metric speed limit sign in NSW
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