NOTE: Just because your bike, car or motor cycle could go 140 mph, that does not mean it is safe. Ride at a slow safe speed. Ride at your own risk. When people in cars or trucks turn and look left and right, they see you coming from the left, and if they see that you on a bicycle they will think your going 10 to 20 mph max. If you are going faster, say 25 or 30 mph a lot of them will pull out after they look right and they will not look left again as they think you are only going 10 to 20 mph and they have enough time to pull out and miss you. If your going real fast, they pull out and you run into the side of the car or truck and that is not a good thing for any one. Make eye contact when you approach a vehicle and do not assume that they saw you and realize where you are. Always wear all your safety gear, maintain your bike in top notch condition and always have two good working brakes.
A motorized bicycle should not go more then 30 mph or what ever the stated max speed is in your local area, city or state. It is up to you to find out your own city, state and local laws regarding a motorized bike, trike or any motorized vehicle.