Australia's biggest freight trucks will be given the green light to drive on the Eastern Freeway, EastLink and the new North East Link within 10 years after the $16.5 billion toll road is built.

Trucks, 30 metres long and weighing more than 85 tonnes, have been banned from most Victorian roads due to their size, but the new highway linking the M80 Ring Road and the Eastern Freeway will be built to accommodate the hulking road trains.

The new generation of trucks, referred to in the industry as high-productivity freight vehicles, will make trips along the Eastern Freeway, between Springvale and Bulleen Roads, as well as EastLink and the North East Link.

The North East Link Authority is investigating which of the high-productivity freight vehicles will be given access, including whether the new tollway will accommodate A Doubles, which are 30 metres long and weigh up to 85.5 tonnes, and still rarely used on Victorian roads.