The following terms as used herein shall have the indicated meanings:
"Traffic" shall include pedestrians, ridden animals, herded animals and vehicles whether moved by human power or otherwise.
"Vehicular crossings" shall include not only bridges and tunnels operated by the Port Authority, but also their plazas and approaches, but shall not include any lands granted by the Port Authority to the States of New York or New Jersey or to a municipality for street or highway purposes even though such street or highway constitutes a means of access to or egress from such vehicular crossing.