UPDATE: 8.17am: Police have advised that the Midland Highway is now clear and open.
UPDATE 7.30am: Tas Police says that the Midlands Highway will now be completely blocked for the next hour as attempts to right the truck are made.
Tasmania Police is urging early morning travellers on the Midland Highway near Bagdad to delay their plans following a truck crash overnight.
A fully-laden semi-trailer rolled on the highway just before 11.30pm last night.
Police did manage to open one lane of the highway just after 11.30pm.
However, heavy machinery was called in just after 5.30am this morning, which has now blocked the road again.
Police say that both the truck and trailer have been emptied of cargo to allow for the vehicle to be righted. Police on scene advise that it will possibly take another three hours.
Police are urging motorists to delay their travel plans if heading north, or to use Mudwalls Road to avoid extended traffic delays.
MORE TO COME