A truck driver who walked away from dramatic truck crash that closed State Highway 2 in Takapau for seven hours was fortunate there was no oncoming traffic at the time, police say.

The road alongside the Central Hawke's Bay town was closed after the crash from 3.55am on Tuesday to 11am, as tow truck drivers, police and firefighters helped right it safely.

Police at the scene said the south-bound truck appeared to have veered left off the road onto the grass verge, spun 180 degrees and tipped.

It ending up facing north, with the truck on its side partially in a paddock and the trailer unit upright but blocking the northbound lane.

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Conditions at the time of the crash were wet and windy.

A truck rolled on SH2 Takapau but its trailer remained upright. Photo / Rachel Wise.
A truck rolled on SH2 Takapau but its trailer remained upright. Photo / Rachel Wise.

The truck driver walked away without injury.

Emergency services were called to a crash early this morning on SH2 Takapau. Photo / Rachel Wise
Emergency services were called to a crash early this morning on SH2 Takapau. Photo / Rachel Wise

Detours were put in place between Charlotte St and Sydney St as clean up crews arrived and police investigated the cause of the crash.

Police said as part of their investigation they would be reviewing the truck's dashcam footage.