The use of the terminology of a 'High Speed Road' and a 'Low Speed Road' is often used in traffic management. The interpretation as stated in the Road Management Act are as follows:
- A ‘high speed road’ is a road in which a permanent speed limit of greater than 60 km/h applies.
- A ‘low speed road’ is a road in which a permanent speed limit of 60 km/h or less applies, but not being a speed limit which applies only because of a temporary reason such as roadworks or a street event.
There are over 17.6 million vehicles on roads in Australia of which 4.4 million of those vehicles are on Victoria's roads. Travelling on about 151,000 kilometres of roads open for general traffic (from major freeways to minor local roads) and a further 50,000 kilometres of other minor roads and tracks in parks and forests.