Sources say the road is blocked and motorists are facing heavy delays on the A271 Lower Horsebridge, eastbound at the A22 Hailsham Bypass.
Pictures from the scene show a white BMW and a pedal bike by the roundabout.
Emergency services are at the scene.
![Picture by Dan Jessup](https://www.chichester.co.uk/webimg/T0FLMTM2MzY4MTYx.jpg?crop=3:2&width=640)
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Picture by Dan Jessup
![Picture by Dan Jessup](https://www.chichester.co.uk/webimg/T0FLMTM2MzY4MTYy.jpg?crop=3:2&width=640)
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Picture by Dan Jessup
![Picture by Dan Jessup](https://www.chichester.co.uk/webimg/T0FLMTM2MzY4MTYz.jpg?crop=3:2&width=640)
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Picture by Dan Jessup
![Picture by Dan Jessup](https://www.chichester.co.uk/webimg/T0FLMTM2MzY4MTY0.jpg?crop=3:2&width=640)
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Picture by Dan Jessup