Stock Road was originally built to handle such traffic and is currently under utilised. To increase Stock Road's capacity and remove most of the traffic lights along it is a more cost-effective option than building a new highway through existing suburbs. More hazardous goods and freight should be transported by rail reducing the threat to people. Subsidies to road freight must be removed and that money spent on upgrading the rail network. Perth has the second highest road kilometres per person and one of the worst air pollution levels per capita in the world.
High speeds reduce total traffic capacity due to the increased distance required between vehicles.
Faster moving vehicles have more accidents, which obstruct traffic. MRWA continues to install more and more traffic lights along existing highways and then uses this as an excuse to build more highways. Improve traffic signal coordination. That the urban blight continues for sometimes over a decade prior to construction is costly for the local community. MRWA benefits from this devalued status, as it is able to purchase further land at lower prices creating a domino effect.