No person or persons shall operate any vehicle with
the classification of heavy traffic, as defined under § 349.17,
Wis. Stats., over any street or streets, except the streets above
named; provided, however, that it is not the intent of this section
that it shall prohibit the ordinary use of any street for the purpose
of obtaining orders for the delivering or moving of supplies or other
necessary commodities to or from any place of business or residence
fronting on such street.