Where 2 or more accesses serve adjacent single-family residential property, the minimum distance between the nearest points of the 2 accesses shall be at least 20 feet. Where 2 or more accesses serve the same or adjacent non-single family residential development, the minimum distance between the centerlines of access should be preferably at least 200 feet on streets with design speeds below 30 miles per hour (mph) and 300 feet on streets with design speed above 30 mph. If adjacent driveways cannot be separated by these distances, the should be combined into a single joint access. For corner and double frontage residential lots, 1 access on each frontage may be permitted if it is determined by the City Engineer that 2 driveways are needed to provide safe access for traffic entering and leaving the lot because of site distance and geometric design consideration.