The accident, on State Highway 5, was reported to emergency services around 6.20pm.
State Highway 5 near Rotorua is closed following a crash between a bus and a motorbike.
Police said the two-vehicle crash was just north of the State Highway 30A intersection.
The crash was reported to emergency services just before 6.20pm, police said.
One person had been seriously injured and motorists were advised to avoid the area and expect delays.
The road was expected to remain shut for several hours, and diversions were in place.
Gloucestershire Police are investigating the incident on the M5
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