Justin Bieber took his Can-Am Spyder into Bev Hills Thursday … and when traffic got too congested for his taste, he maneuvered it onto the sidewalk where he rode illegally … almost hitting someone.

Bieber comes off the sidewalk at an intersection, and comes close to creaming an elderly woman with a walker.

He clearly doesn’t care … because seconds later he’s rocking out to music as he waits at a light.

BTW …Beiber’s on probation for the egg throwing incident, which means he’s not allowed to violate any laws. Lucky for him … no cops in sight.

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