Emergency services were called to a report of a generator having fallen off a vehicle and hitting two pedestrians in Etchingham High Street near the level crossing just before 6.55am.
The 40-year-old woman, believed to be from Etchingham, died at the scene ‘despite emergency services’ best efforts’, according to a South East Coast Ambulance Service (SECAmb) spokesman.
A 42-year-old man from Ashford, Kent, was arrested on suspicion of causing death by dangerous driving and is in custody.
A 44-year-old man, also believed to be from Etchingham, suffered serious injuries and was flown to the Royal Sussex County Hospital, Brighton, and is in a stable condition.
The road was closed eastbound at Oxenbridge Lane but has re-opened at 1.45pm.
Paramedics in three ambulances and four response cars were sent to the scene along with police.
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