A silver Audi crashed off a Hamilton roundabout yesterday, landing at a portal of a tunnel for cyclists and pedestrians.
The drop from the road to the foot and cycle path is about 3m.
The driver left before police got to the scene of the crash, which occurred about 7.30am at the intersection of Wairere Drive, Gordonton Rd and Crosby Rd in the suburb of Chartwell.
A police spokeswoman said officers were "continuing inquiries to locate the owner and the driver of the vehicle".
The car has been towed and the Waikato police said on Facebook: "The roads were wet this morning in Hamilton and the driver of this vehicle was not driving to the conditions; with witnesses believing the vehicle was travelling in excess of 100km/h."
"Wet + roundabout + speed = not a very smart driver and no more drivesies!
"The driver from the vehicle decamped before Police could speak to them, and our investigations are continuing.
"We are grateful no one was walking or cycling through the underpass at that time."
The police ask witnesses to call 07-858 6200 if they can provide further information.