The A351 Sandford Road is closed in both directions, with queueing traffic after an accident involving a bus and a pedestrian at Keysworth Drive at Sandford in Dorset. Opposite St. Martin's School.
The area is a major route to several local events this weekend. Police sya the incident is likeley to cause long delays.
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Sussex astronaut Tim Peake's space mission will be celebrated with a free exhibition at The Novium Museum in his home city of Chichester.
Emergency rescue teams were at the scene in East Sussex.
Plenty of warm sunshine with the chance of thundery showers later.