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0 6 <br />2 <br />A technical rationale was developed to differentiate the impacts of potential traffic generated by <br />subdivisions of different lot counts and based on the type of road. Road widths and design <br />configurations can accommodate varying amounts of traffic volume, so it is important to <br />evaluate the relative_ impacts to a road system not based solely on lot count but also on the <br />capacity /design of the adjacent road. Below are some examples of how traffic impacts can be <br />equated on different roads and different size /scale subdivisions. The thresholds are objectively <br />based on percentage traffic increase to the total capacity of the road system. One must also <br />understand that prior to total road capacity buildout, the road has actual lower traffic counts <br />that, from a subjective standpoint, create a relatively higher percentage traffic increase in the <br />interim. <br />DAILY CAPACITY <br />Subdivision <br />Subdivision <br />Rural Road <br />Suburban Road <br />Urban Road <br />Size <br />Traffic <br />2 -lane (LOS `B') <br />2 -lane (LOS `D') <br />3 -lane (LOS `D') <br />(# of Lots) <br />(Trips Per Day) <br />4, 0 00 <br />12, 0 00 <br />,0 <br />16,000 <br />20 <br />200 <br />5.0 <br />1.7 <br />1.3 <br />40 <br />400 <br />10.0 <br />3:3 <br />2.5 <br />80 <br />800 <br />20.0 <br />6.7 <br />5.0 <br />The impact of projects in rural areas with over 5.0% traffic increase above total capacity <br />comports to significant changes warranting the additional review through the subdivision and <br />zoning process. Although Level of Service (LOS) `D' is commonly used as a benchmark for <br />urban planning purposes, a LOS 'B' may be more appropriate in rural areas where maintaining <br />rural character and safety for agricultural operations is of greater importance. <br />The following provides a summary of the Articles /Sections of the County's Subdivision <br />Regulations and Zoning Ordinance that will need to be amended to incorporate the proposed <br />changes to the Growth Management System lot number thresholds. The attached table <br />provides the existing and proposed thresholds. <br />Subdivision Regulation Changes: <br />Amend Section II (Definitions) and Section III -D -3 (Preliminary Plat Approval) of the Subdivision <br />Regulations to require subdivisions with more than 20 lots in rural designated areas to follow a <br />planned development/special use permit/zoning atlas amendment process. Specifics provided <br />in attached Ordinance. <br />Zoning Ordinance Changes: <br />Amend Article 22 (Definitions), Article 4.1 (Establishment of Use Regulations), Article 4.3 <br />(Permitted Use Table), and Article 6.29.4 (Additional Requirements for Certain Subdivisions) of <br />the Zoning Ordinance to require subdivisions with more than 20 lots in rural designated areas to <br />follow a planned development/special use permit/zoning atlas amendment process. Specifics <br />provided in attached Ordinance: <br />Process <br />1) Public Hearing to be held on November 24, 2003. <br />2) Planning Board to make recommendation to BOCC. <br />3) BOCC makes final decision <br />GAComprehensive Planning Div1GENE\2003 Public Hearings\Nov 24\,Subdivs of 20+ Lots PDSUP\Abstract 111203.doc <br />