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(3) a. New boundary streets shall be avoided except where a requirement of the master street plan provides a defined alignment. In that event, the development or plat proposed shall provide half the master street plan specified improvements and right-of-way. Whenever a proposed subdivision abuts a partially dedicated or constructed public street,the developer shall provide the minimum of half the required improvements and right-of-way. b. The planning commission may authorize a new boundary street when the subdivider proposes to dedicate the entire right-of-way and construct all the required improvements. c. In no case shall a subdivider retain a parcel of land lying between a newly created boundary street and a former property line, the purpose of which would be to deny access by abutting owners. (4) For purposes of determining the extent of required improvements on boundary streets,the right- of-way centerline shall be deemed to be the plat boundary. Where a clearly defined right-of-way does not exist,the city shall establish the centerline location. (5) For dead-end streets and cul-de-sacs: a. Cul-de-sacs shall have a maximum length of 750 feet unless otherwise approved by the Fire Chief and planning commission. Where a street does not extend to the boundary of a subdivision, and its continuation is not required by the planning commission for access to adjoining property, its terminus shall not normally be closer than 50 feet to such boundary. b. Cul-de-sac turnarounds shall be provided at the end of all permanent dead-end streets. Cul-de-sac turnarounds for residential streets and minor residential streets shall have a minimum right-of-way diameter of 100 feet and a pavement width diameter of 80 feet, with an optional inside radius of 20 feet to the back of the curb and 40 feet to the outside of the back of the curb. c. In the case of temporary dead-end streets,which are stub streets designed to provide future connections with un-subdivided adjacent areas, the planning commission may require a temporary easement for a turnaround of the type discussed in subsection (b)(5)b. of this section or an appropriate area for a back around. d. Hammer heads and T turnarounds are not allowed. (6) Grades on streets shall not exceed the following standards: a. Principal and minor arterials,nine percent. b. Collector streets, 12 percent. c. Residential streets, 15 percent. d. Minor residential streets, 16 percent. e. Residential cul-de-sac, 16 percent. Cul-de-sac centerline slope surface on downhill grades • shall not exceed seven percent within the last 50 feet of the pavement. Cul-de-sac centerline slope surface on uphill grades shall not exceed 12 percent within the last 50 feet of the pavement. - 167 - Batesville Subdivision Regulations