A 27-year-old Yakamia man was killed when his vehicle left the road near Williams early on Sunday morning.
Trevor Laudehr was driving his Toyota sedan north on Albany Highway, Arthur River at around 6.30am, when he failed to negotiate a sweeping left-hand bend.
The vehicle drifted off the road and crashed into a tree.
Mr Laudehr died at the scene. Wet weather and fatigue are suspected contributors to the crash.
Approximately 90 per cent of fatal crashes on WA roads this year have been single vehicle crashes.