Disturbing video of a crash that left a South Australian motorcycle rider in a coma has now been shared with the public as a warning against dangerous driving.

The motorcyclist was clocking more than 260km/h as he weaved in and out of traffic.

He then slammed head-first into a stationary ute.

He remained in a coma for two months and now has a permanent brain injury.

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The South Australian government is using the video to promote tough new laws being introduced tomorrow that crackdown on hoon drivers.