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Vehicle overturn 0.544* 0.323 0.092 1.722

Speed limit (km/h)

60-79 -0.600** 0.285 0.036 0.549

80 and 99 -1.140** 0.454 0.012 0.320

> 100 -2.633*** 0.633 0.000 0.072

Road classification

Freeway or highway 1.117*** 0.355 0.002 3.056

Main road 0.930*** 0.292 0.001 2.533

Special road facility

Yes -2.140* 1.105 0.053 0.118

Road division marking

Divided double line -0.877** 0.432 0.042 0.416

Percentage of heavy vehicles -0.051** 0.026 0.049 0.951

Constant -0.530** 0.263 0.044 -

Note: ***, **, * denote statistically significant at α= 1%, 5%, 10%

As shown in Table 3.2, heavy-vehicle right-turn and left-turn movements prior to collisions

are positively correlated with crashes at intersections. Right-turn movement by a heavy

vehicle is over eight times (OR=8.474, p<0.001) more likely to result in single heavy-vehicle
crashes at intersections, while left-turn movement is over seven times (OR=7.409, p<0.001)

more likely to result in single heavy-vehicle crashes at intersections than corresponding
crashes at mid-blocks. These results were expected, because heavy vehicles are more likely to

do a right or left turn at intersections than in mid-blocks. Turning movements at mid-blocks
are most likely associated with entry and exit from properties, which are less frequent than

turning movements at intersections. Another possible explanation may be the insufficient

turning space at smaller roundabouts in Melbourne and other urban Australian cities to
accommodate large heavy vehicles (Austroads, 2003).

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