(a) To Comply With Traffic Laws. Every person pushing, propelling, moving or drawing any hand cart or hand truck used for the transportation of persons or property upon any roadway shall be granted all of the rights and shall be subject to all of the duties applicable to the driver of a vehicle by the Vehicle Code of this State and ordinances of this city, except those provisions which by their very nature can have no application.
(b) To Conform to Traffic Flow. No person shall push, propel, move or draw any hand cart or hand truck used for the transportation of persons or property on a roadway in a direction opposed to the flow of traffic thereon.
(c) Cross Roadway at Right Angles to Curb. No person, while so pushing, propelling, moving or drawing any hand cart or hand truck, shall cross a roadway at any place other than by a route which is at right angles to the curb, or by the shortest route to the opposite curb except in a marked or unmarked crosswalk.
(d) Exemption. This section shall not apply to any employee of this City who is required to push, propel, move or draw a hand cart or hand truck upon any roadway as part of his official duties.