The A647, better known as the main Boothtown Road, was cracked open by gallons of water. The burst itself is situated just between the junction at Ploughcroft Lane and Claremount Road.
It is the main commuter route between Halifax and Queensbury.
Yorkshire Water say they are carrying out 'major repairs' to the road.
Signed diversions are in place and the 576 First West Yorkshire bus service 576 has been diverted via Brighouse Road, Denholme Gate Road and Halifax Road.
Video courtesy of Kara Colvin.