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This project aims to assess the role of headway in crashes in Australia. Short headway or close following in moving traffic is often held responsible for rear end crashes which account for nearly one-quarter of all crashes (23.5 per cent) in Australia.

There are rear end crashes at speeds as low as 40 km/h that result in fatalities. If time headway is less than the reaction and braking time, it could lead to such crashes. There exists a literature gap in understanding the safe distance between consecutive motor vehicles and what scenarios compel drivers to undertake risky manoeuvres that lead to rear end crashes and longer-term injuries.

The primary aims of this research are to systematically review the current state of knowledge about the role of unsafe headway on road safety and to assess close-following or unsafe headways on roads in Australia using the Australian Naturalistic Driving Study (ANDS) data.

Study updates through academic papers are available at

Category: Road Safety

Researcher: Raaj Biswas

Supervisor: Dr Julie Hatfield

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