No person operating any street car or interurban car, along any street or along or over a private right of way, shall stop any such car for the purpose of taking on or letting off any passengers, at such a place or in such a manner that any platform or step of such car will be over or above an unsafe place, or in such a manner that any passenger in boarding such car or in alighting therefrom at either end thereof will be compelled to step in or upon any place dangerous to life or limb.