A 74-year-old woman has been taken to hospital with "life threatening" injuries after being knocked down by a road sweeper's cart.
The accident happened outside Preston Manor in London Road, Brighton, at about 11am.
The woman, who has not been named, was taken to hospital.
No one else is believed to have been injured.
Hove Road Policing Department attended the incident and will be carrying out an investigation with the Health and Safety Executive.
A Sussex Police spokeswoman said: "There was a nasty accident between a road sweeper and a pedestrian.
"The woman's injuries are life-threatening."
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