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Unknown 38.0 39.9

Continuous Variables

Percentage of heavy vehicles 8.8 (5.6) 6.9 (4.1)

Note: Distribution (%) of collisions reported for categorical variables.

Mean (and standard deviation) reported for continuous variables

From 2003 to 2012, there were 556 single-vehicle crashes involving heavy vehicles in the

Melbourne metropolitan area. Of the 556 crashes, 253 (45.5%) occurred at intersections and
303 (53.5%) occurred at mid-blocks. According to the VicRoads' user guide for the crash

data provided, an accident within 10 metres of an intersection is defined as an intersection
crash. In addition, collisions on freeway interchanges and overpass roads are also considered

as collisions at intersections (Vicroads, 2008).

Heavy vehicles in this research included vehicles in several categories in 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, farm, etc.) were not included

in this study.

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