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 On the other hand, crashes in mid-block are more likely to be related to higher

posted speed limits (60km/h and higher), a higher percentage of heavy vehicles
in traffic, special road facilities, and roads with divided double lines.

The study has clearly identified factors contributing to single heavy-vehicle collisions at
intersection and mid-blocks. To improve heavy-vehicle safety, preventive measures should

be carried out, based on the identified factors contributing to single-vehicle crashes involving
heavy vehicles at crash locations.

6.1.2 Influence of neighbourhood socioeconomic characteristics on heavy-vehicle
crashes

The safety of road users in crashes involving heavy vehicles has drawn considerable

attention, not only from transportation agencies but also the health sector due to their over-
representation in traffic fatalities and serious injuries. Therefore, the second study (Chapter 4)

examined the socio-demographic characteristics of neighbourhoods where road users reside
and where crashes occur on road-user injury severity in collisions involving heavy vehicles in

Victoria, Australia using the multinomial logit model. The key conclusions on the socio-
demographic characteristics of neighbourhoods where road users reside and where crashes

occur on road-user injury severity are summarised below:

 With respect to the neighbourhood characteristics of the location of the collision,

the findings show that crashes occurring in neighbourhoods with a higher

proportion of professionals are related to a higher likelihood of severe injuries
rather than less severe injuries, while the proportion of sales people and people

born in Australia are found to have mixed effects.

 In terms of road user residential neighbourhoods, road users residing in
neighbourhoods with a higher proportion of people with university education or

a higher proportion of people working in sales are less likely to be associated

with injury outcomes compared to the non-injury outcome. On the other hand,
road users residing in neighbourhoods with a higher percentage of people born in

Australia are more likely to suffer injuries rather than not suffer any injury at all.

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