Police are investigating a fatal collision in Felpham.
Emergency services were called at 10.08am on Friday to Felpham Way, where a heavy goods vehicle and a cyclist had collided.
The cyclist, an 81-year-old woman, was pronounced dead at the scene.
Her next of kin have been informed.
A 38-year-old man was arrested on suspicion of causing death by driving without due care. He remains in custody.
Anyone who witnessed this incident or who has dash-cam footage, is asked to report details online or phone 101, quoting Operation Kirkham.