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Location
Metropolitan Melbourne 1.2 15.1 29.5 54.2
Non-Melbourne (reference) 4.2 22.0 30.9 42.9
Road classification
Freeway or highway 2.4 17.7 29.1 50.8
Main road (reference) 2.1 17.2 31.1 49.6
Others 4.6 28.5 28.8 38.0
Speed limit (km/h)
<50 1.2 16.8 34.8 47.2
60-70 1.3 15.9 30.2 52.7
80-90 1.7 16.4 28.6 53.4
> 100 (reference) 4.4 21.3 28.8 45.5
Not known 0.7 10.2 39.8 49.3
Police attendance at crash scene
Yes 2.6 19.6 27.9 49.8
No/Unknown (reference) 0.1 4.8 43.7 51.4
Crash Characteristics (continuous variables - mean and standard deviation)
Percentage of heavy vehicles 17.9 (10.5) 13.8 (9.2) 12.6 (8.6) 11.8(7.9)
Right shoulder 0.9 (1.0) 0.6 (1.0) 0.5 (0.9) 0.6 (0.9)
Heavy vehicles in this research included vehicles in several categories under the VicRoads
classification scheme: prime mover only, prime mover (single trailer), prime mover (B-
double and B-triple), prime mover (number of trailers unknown), light commercial vehicle
(rigid < 4.5 tonnes), heavy vehicle (rigid > 4.5 tonnes), and rigid truck (weight unknown).
Note that buses and other types of heavy vehicles (machinery, farming, etc.) were not
included in this study.
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