A double-decker bus carrying 70 Hinkley Point C workers overturned in icy road conditions in Somerset.
Police attended the crash, which was declared a major incident, and also involved a motorcyclist, on the A39 near Cannington at about 06:00 GMT.
There were 70 people on the bus and 54 patients were treated at the scene, but there were no fatalities, a spokeswoman for Avon and Somerset Police said.
Bridgwater MP Ian Liddell-Grainger said three had significant injuries.
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