(D) Campus police officers may designate and operate emergency vehicles and patrol cars in the manner provided by law for municipal and county law enforcement officers. Such a vehicle must bear distinctive and conspicuous lettering which reads "campus police" on the sides and rear of the vehicle. The provisions of this chapter may not be construed as a diminution or modification of the authority or responsibility of a municipal police department, sheriff, constable, or other peace officer either on the property of an institution or otherwise.