For the purpose of this chapter:
(a) "Operator" means and includes every individual who operates a vehicle as the owner thereof or as the agent, employee or permittee of the owner.
(b) "Person" means and includes any individual, firm, copartnership or corporation.
(c) "Street" means any public street, avenue, road, boulevard, highway or other public place located in the City, and established for the use of vehicles.
(d) "Vehicle" means any device in, upon or by which any person or property is or may be transported upon a street. (1949 Code §64.2.)