The large vehicles are usually banned from side roads near the highway as they are considered too dangerous.

The distance between the rail line and the highway is about 29 metres, while the road trains are 36.5 metres long.

Previously trucks have had their rear blocking the highway when they stop at the rail crossing, or their rear hanging over the railway line as they wait to re-enter the highway.

But road trains will be allowed to use these routes ahead of next year’s $1million realignment of the highway.

The State Government has worked together with Main Roads and rail operator Westnet to devise a radio call system with on-the-ground ‘spotters’ alerting transport operators of train movements through the area.

It involves spotters calling truckies on a standard CB frequency to advise them when trains are approaching.

They system was implemented last year and was successful.

The spotter system will commence October 22.

The highway realignment project, due to start early next year, will modify four intersections along a 50km stretch near Salmon Gums.

About 30 freight trains travel through the area each week.