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A woman unknowingly live tweeted her husband's death in a motorway crash while sharing local traffic updates.

Caran Johnson, who tweets about local news and traffic incidents in Vancouver, Washington state, began following live updates following a three-vehicle collision yesterday afternoon.

What began as a routine series of traffic tweets turned to personal tragedy as Caran, who tweets under the name @ScanCouver, began to suspect her husband Craig was involved in the smash.

After asking fellow social media users for a description of the vehicles involved and contacting police with her husband's registration, the devastating truth was revealed.

Caran simply tweeted: "it's him. he died."

Craig Johnson was declared dead at the scene after his Hyundai was in a head-on collision with a Toyota Ute. The female driver of the other vehicle was taken to hospital.

Here is how the tragedy played out on Twitter.