If you have a helmet yes
Yes.
All Bicycle riders under 18 are required to wear a helmet
Under 21 for a motorcycle and under 16 for a bicycle.
According to http://en.wikipedia.org/wiki/Electric_bicycle_laws#Massachusetts The legal definition/description of an electric bicycle is most closely described in the code as a "motorized scooter" in that it is powered by an electric motor and/or human power [34]. It may be also be described as a "Motorized bicycle". However, that description does not include electric powered motor specifically. And it appears that the legal definition "Motorized Bicycle" and "Motorized Scooter" are in conflict. Motorized bicycle is a pedal bicycle which has a helper motor, or a non-pedal bicycle which has a motor, with a cylinder capacity not exceeding fifty cubic centimeters, an automatic transmission, and which is capable of a maximum speed of no more than thirty miles per hour. A motorized bicycle shall not be operated upon any way, as defined in section one within the commonwealth by any person under sixteen years of age, nor at a speed in excess of twenty-five miles per hour. A motorized bicycle shall not be operated on any way by any person not possessing a valid driver’s license or learner’s permit. Every person operating a motorized bicycle upon a way shall have the right to use all public ways in the commonwealth except limited access or express state highways where signs specifically prohibiting bicycles have been posted, and shall be subject to the traffic laws and regulations of the commonwealth and the regulations contained in this section, except that the motorized bicycle operator may keep to the right when passing a motor vehicle which is moving in the travel lane of the way, and the motorized bicycle operator shall signal by either hand his intention to stop or turn. Motorized bicycles may be operated on bicycle lanes adjacent to the various ways, but shall be excluded from off-street recreational bicycle paths. Every person operating a motorized bicycle or riding as a passenger on a motorized bicycle shall wear protective headgear conforming with such minimum standards of construction and performance as the registrar may prescribe, and no person operating a motorized bicycle shall permit any other person to ride a passenger on such motorized bicycle unless such passenger is wearing such protective headgear.
Anyone under the age of 18 must wear a helmet when riding a bicycle.
It as implemented in 1999 that any person under the age of 16 must where a helmet hile bicycling in the state of Maine.
That depends upon what you are calling a "street bike". In California, non-motorized bicycles do not need a license plate. If it is a motorized bicycle, it does. Under California's DMV website, there is a page titled "Motorcycles, Mopeds and Scooters Defined". It explains that only motorized scooters do not require registration.
To properly fit a bicycle helmet for maximum safety and protection, follow these steps: Position the helmet on your head so it sits level and covers your forehead. Adjust the straps so they form a V-shape under your ears and are snug but not too tight. Buckle the chin strap securely and make sure it is centered under your chin. Check that the helmet does not move when you shake your head. Make sure there is no more than two fingers' width between your eyebrows and the helmet. Test the fit by pushing the helmet from side to side and front to back - it should not move. By following these steps, you can ensure your bicycle helmet fits properly and provides the maximum safety and protection while riding.
To ensure the proper fit of a bicycle helmet, follow these steps: Measure your head circumference to determine the correct helmet size. Position the helmet on your head so it sits level and covers your forehead. Adjust the straps so they form a V-shape under your ears and are snug but not too tight. Make sure the helmet does not move when you shake your head. Check for any gaps between the helmet and your head. Test the fit by moving your head in all directions to ensure the helmet stays in place.
To properly wear a bicycle helmet for safety while riding, follow these steps: Place the helmet on your head so it sits level and covers your forehead. Adjust the straps so they form a V-shape under your ears and are snug but not too tight. Make sure the helmet does not move when you shake your head. Check that the helmet meets safety standards and is in good condition before each ride.
To properly wear a bicycle helmet for maximum safety and protection, make sure it sits level on your head and covers your forehead. The straps should form a V-shape under your ears and be snug but not too tight. The helmet should not move when you shake your head. Make sure to always fasten the chin strap securely before riding.
From the California Bicycle Helmet Statute West's Annotated California Codes; Vehicle Codes; Division 11. Rules of the road; Chapter 1. Obeidience to and effect of traffic laws; Article 4. Operation of bicycles:(a) A person under 18 years of age shall not operate a bicycle, or ride upon a bicycle as a passenger, upon a street, bikeway, as defined in Section 890.4 of the Streets and Highways Code, or any other public bicycle path or trail unless that person is wearing a properly fitted and fastened bicycle helmet that meets the standards of the American National Standards Institute (ANSI Z 90.4 bicycle helmet standard), the Snell Memorial Foundation's Standard for Protective Headgear for Use in Bicycling, or the American Society for Testing Materials (ASTM F-1447 standard). This requirement also applies to a person who rides upon a bicycle while in a restraining seat that is attached to the bicycle or in a trailer towed by the bicycle.