There was a fatal collision on the A40, Beaconsfield Old Town, towards Holtspur on Monday, July 30.
At about 8.50pm, a large silver saloon Mercedes left the road on the nearside and collided with a tree.
Emergency services attended the scene and closed the road for approximately four and a half hours whilst accident investigators examined the scene.
The 43-year-old victim from Cookham has yet to be formally identified. He was pronounced dead at the scene.
No other vehicles were involved in the incident.
PC Robert Mellor, said: “I would like to hear from anyone who witnessed the collision or saw the vehicle travelling from Beaconsfield Old Town heading towards Holtspur before the crash."
Contact PC Mellor at Amersham police station on 0845 8 505 505.
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