No taxes or levies shall be assessed upon or collected from the taxable persons or property within the corporate limits of said City, for the construction, improvement or keeping in repair of roads, for the support of the poor of Kanawha County, outside of corporate limits, for any year in which it shall appear that said City shall at its own expense provide for its own poor and keep its own roads, streets, and bridges in good order. And neither the county court of Kanawha County nor the authorities of the district in which said City is situated, shall have or exercise jurisdiction within the corporate limits with relation to the roads, streets, alleys, bridges, wharves, docks or ferries, but the same shall be and remain under the exclusive jurisdiction and control of the Municipal authorities of said City; and said City shall be liable only for the construction, improvement, repair and good order of the roads, streets, alleys, wharves and bridges in its corporate limits, except that the County of Kanawha may become the joint owner and controller with the City of Dunbar in a bridge or bridges across Kanawha River; provided, that nothing in this Charter contained shall be so construed as to interfere with the construction by the county court through said City of the hard road for the construction of which and other roads, an issue of bonds in the amount of one hundred and sixty thousand dollars ($160,000) has heretofore been authorized by the voters of Union district; and the said county court shall construct the said hard road along the route originally laid out through said City, in all respects as if the said City were not yet incorporated; and all the property within said City shall continue to be liable for its proportionate part of the levies laid by the county court from year to year for the purpose of paying the said bonds and the interest thereon, as well as any other district bonds now outstanding against the said district of Union.