BUS passenger Emma Dalby suffered a cut head and fractured ribs in an accident in Harrison Drive, Colne.
Mrs Dalby, 85, was standing waiting to get off the bus when the driver braked.
She fell foward banging her head on a safety rail. The accident happened at 2.30pm on Saturday.
Mrs Dalby of Browsholme Avenue, Burnley, is receiving treatment at Burnley General Hospital.
The bus was being driven by John Brian Nutter-Knight, 62, of Tavistock Street, Nelson.
Sgt Russ Gregory of the traffic unit at Colne said: "It is alleged the driver braked because of a maneouvre by an Audi in front of the bus."
Police have the registration number of the Audi and inquiries are continuing.
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