Dashcam video shows the moment Alec Baldwin crashed his wife Hilaria 's Range Rover headfirst into a tree.

The footage is from a front-facing camera on the garbage truck Alec claims cut him off ... and you see the commercial truck pull out from a driveway onto the main road, making a right turn before Baldwin's SUV comes into view and crashes into a tree trunk in East Hampton, New York.

It appears the garbage truck slows down as Alec goes around to the right, drives off the road and smashes into some timber. Play video content

We broke the story ... Alec crashed Monday while his brother Stephen was riding shotgun.

Alec claimed a "garbage truck the size of a whale" cut him off and forced him to swerve to avoid colliding with the truck. Play video content

As we first rep

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