Town of Summerville Planning Area - BCD Council of Governments

Transporation Corridor Analysis – Travel Demand Modeling ScenariosTwo roadway corridors within the Planning Area have been analyzed with alternative design andconstruction standard recommendations. The first modeling scenarios identified in Figures 2.6 – 2.10examine design alternatives for Bacons Bridge Road (near Trolley Rd intersection to Ashley River Rd). Thesecond modeling scenario identified in Figures in 2.11 ‐ 2.13 examine alternatives for US Highway 78 (FifthStreet North) from Berlin G. Myers Parkway towards the Four Hole Swamp.Bacons Bridge Road:The modeling scenario for Bacons Bridge Road begins at the end of the existing four lane section of BaconsBridge Road near the Trolley Road intersection. The Dorchester County Penny Sales Tax Program proposesa four lane section stretching to approximately ½ mile south of Ashley River Rd. Two sets of scenarios areanalyzed for the scheduled upgrades of Bacons Bridge Road from two to four travel lanes.Figure 2.6 shows projected Level of Service (LOS) with four lanes and a continuous middle turn lane.Figure 2.7 shows Bacons Bridge Road with four lanes and a landscaped median. The second set ofscenarios identified in Figures 2.9 & 2.10, show roadway levels of service for two different designalternatives discussed as potential options by the Town’s Planning Commission during the ComprehensivePlanning process.Two Scenarios ‐ Continuous Middle Turn Lane and Landscaped Median:Figure 2.7 identifies a relief in traffic congestion between Dorchester Road and Ashley River Road by wayof increased capacity. The scenario shows a 40% gain in traffic capacity when a median is constructed inconjunction with proper access management measures. While the traffic volumes do not differsubstantially between Figure 2.6 & 2.7 there is approximately a 17% increase in corridor capacity with theconstruction of a median with the 4 lane widening project as illustrated in Figure 2.8.Figure 2.6 - Roadway LOS with FourLanes and Continuous Middle Turn LaneFigure 2.7 - Roadways LOS with FourLanes and Landscaped MedianAppendix 1: BCDCOG Travel Demand Modeling Scenarios Page 4