Large parts of the Department of Transport and Main Roads (TMR) road network are sealed with bituminous sprayed seals. Increasingly, these seals are left in service longer than the presumed target age for replacement. It is increasingly common across the state to have seals exceeding the target replacement age by more than 30%. This is due in part to budgetary constraints. However, the risks to the integrity of the road infrastructure associated with these seals are largely unquantified, whereas the recent extreme weather and flood events highlighted the potential vulnerability of pavements
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