motorcycle,such as YAMAHA;Kawasaki; can i ride it in USA freeway?
To be legal, you need a motorcycle driver's license or endorsement, mere permit is restricted from freeways. Most States restrict freeways from use of pedestrians, bicycles, animals, and motor-driven cycles. The definition of motor-driven cycle varies. The Federal definition of a motor-driven cycle is a motorcycle with a motor that produces 5-brake horsepower or less. -- www.nhtsa /cars/rules/import/F. Some States do not define a motor-driven cycle, and there is no low limit on motorcycles -- as long as they can do the minimum speed, usually 45 mph. Some States agree with the Federal's 5 bhp limit. If you have an old 1964 Honda 50 Sport rated at 5 bhp it is legal on the freeway, or any motorcycle that has 5 bhp or more. The rest of the States agree with California's definition, a “motor-driven cycle” is any motorcycle with a motor that displaces less than 150 cubic centimeters. -- leginfo.legislature.ca /faces/. My Vespa has 150.46cc and is 50-State freeway legal. I am legal, safe, but insane with a 65 mph top speed.
The minium cc is 150 in most places.
To add to Chris- some states will restrict first year rider, permit rider to day time and no interstate access
