MAYFIELD VILLAGE, Ohio--(BUSINESS WIRE)--The summer travel season is peak time for passionate motorcycle riders and after a brutal winter, they’re anxious to make the most of every mile. If fact, more motorcycle riders are hitting the road than ever before with new motorcycle sales up more than eight percent through the first quarter, according to the Motorcycle Industry Council. In light of that growth, Progressive® Insurance set out to see what useful information could be found by analyzing i