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Can you recommend good research for us to review regarding edge drops and motorcycles?  Of special interest is the milled edge at lane or edge locations.

I do not know of any specific studies regarding motorcycles. I sent an email to Dr. Clay Gabler at VT who has done a large amount of motorcycle accident research. If anyone knows about a motorcycle accident study in this area, it would be him.

His reply was as follows.

"I can see how motorcycle and a pavement edge dropoff could be a tough problem. Probably even tougher than a car which attempts to steer too quickly back onto the highway after going off the pavement edge.  However, we have not come across any studies to date on the motorcycle crashes involving pavement dropoff.  Likewise, none of the crashes that we have investigated to date have involved this as a crash causation mechanism. "

At this time, it doesn't appear that there is much guidance or study in this area. I will keep a lookout for studies and let you know if I find any.