Man falls off Motorcycle

This guy merged onto the I-80E (Sacramento, CA) on his motorcycle as we were driving in the fast lane. As he merged, his bike would shake and wobble. He sometimes would only have one hand on the handle bars while it was shaking!! We couldn’t figure out why it was shaking, but we noticed it would only do it once he hit high speeds. We paced him for 5-10 miles after watching him “almost“ loose control (about 5 or 6 times), so I got my phone out, thinking “its only a matter of time before he crashes“ and I wa