Gwyn Williams was over taken by the ambulance shortly before the crash in the New Forest and told ITV Meridian what he saw.
He had been driving along the A336 between Brockenhurst and Lyndhurst in the New Forrest.
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Martin has the forecast for the east of the ITV Meridian region.
Martin Stew has Friday's weather forecast for the west of the ITV Meridian region.
Friday's forecast for the west of the region from Martin Stew.