A woman, aged in her 80s, ploughed her car into a supermarket building.
Police and paramedics were called to Tesco in London Road, Tring, just after 2pm on Tuesday.
The blue Volkswagen Golf mounted the pavement, smashed through a brick pillar and crashed into the trolley area.
The elderly driver suffered minor injuries and was not taken to hospital. The car had to be recovered.
A Tesco spokesman refused to comment on the accident.