“Boulevard,” means a highway not less than 30 and not more than 100 feet in width and upon, along, and over the portion or portions of which where the same is less than 60 feet in width no railroad, electric road, or street railroad shall, except upon a permit granted therefor by the board or body in control of such boulevard evidenced by an order entered in its minutes, be constructed or operated; and any easements granted or condemned for the building of said boulevard shall be so granted or condemned. This section does not prevent or limit the use of vehicles across the boulevard.