A person propelling or riding on a bicycle shall not ride other than upon or astride a permanent and regular seat attached thereto, nor shall he ride with his feet removed from the pedals, or with both hands removed from the handlebars, nor shall he practice any trick or fancy riding in a street. No bicycle shall be used to carry more persons at one time than the number for which it is designed and equipped.
N.J.S. § 39:4-12