Parking on lawn areas. The parking of any vehicle shall not occur on lawn areas, unpaved public rights-of-way or other unpaved locations in District "R-R", "R-1", "R-2" and "R-3". Parking shall be limited to areas that are hard-surfaced and shall generally be located in close relationship to the garage or otherwise vehicle orientated portion of the premises so that the lawn area may be maintained in grass, trees and shrubs. Parking and/or storage of trucks in excess of one (1) ton, construction equipment, truck-tractors, tractor-trailers, trailers, recreation vehicles, boats or buses in any zoning area with a "R" (residential) designation is prohibited, unless otherwise provided for herein; provided that said vehicles may be parked in conjunction with deliveries, trucks may be parked in an enclosed garage, construction trucks may be parked when construction work is actually in progress in connection with the premises, and trucks may be parked on the premises in connection with any emergency.