Dubbo City Council manager technical support Mark Stacey said the extensions would create a shorter route that did not go through the Dubbo urban area.

"Council has strategically identified these local roads for connectivity from the Mitchell Highway west of Dubbo, east to the Newell Highway (Troy Junction) and north Dubbo industrial area and further east to the Golden Highway," he said.

"Some sections of these roads are approved for restricted access vehicles (RAVs) such as B-doubles and road trains. However, the proposed route at present does not provide a continuous link as the roads are fragmented by inadequate intersection geometry unsuitable for RAVs such as the Troy Junction."

The B-double route along Rawsonville Bridge Road has also been approved for an extension.

The route will be extended for about four kilometres along Rawsonville Bridge Road and for 0.61 kilometres along Glenisla Road, following a request from SRH Milk Haulage.

However, the B-doubles are not permitted access along Rawsonville Bridge Road during the school bus service times and have a 70 kilometre per hour speed limit along Rawsonville and Glenisla roads.

Councillor Allan Smith said the road train extensions had been brought forward because of Dubbo's recognition as a transport hub.

"The improvements that have happened on the Mitchell Highway and the improvements that are happening at Troy to get road trains on to this section of the road will not only be good for the yards but good for the vehicle movements around Dubbo," he said.

"All of the improvements that have been done along those roads in recent years by our engineering division are now paying off and will make transport a lot easier in our city."