TABLE OF CONTENTS INTRODUCTION .............................................................................................................................................................................. 2 PROPOSED LAND DEVELOPMENT PLAN ................................................................................................................................... 2 STUDY AREA ................................................................................................................................................................................... 2 EXISTING PM PEAK HOUR TRAFFIC VOLUME CONDITIONS .................................................................................................... 2 ESTIMATE OF SITE GENERATED TRAFFIC ................................................................................................................................. 3 PROJECT TRIP DISTRIBUTION AND ASSIGNMENT ................................................................................................................... 5 ROADWAY SEGMENT ANALYSIS ................................................................................................................................................. 7 CONCLUSION .................................................................................................................................................................................. 7 LIST OF TABLES TABLE 1 - TRANSPORTATION CONCURRENCY ROADWAY NETWORK SEGMENTS ...................................................................................... 2 TABLE 2 – CMS TRAFFIC DATA FOR STUDY AREA SEGMENTS ............................................................................................................... 3 TABLE 3 - PM PEAK HOUR TRIP GENERATION - PROPOSED USES .......................................................................................................... 4 TABLE 4 – PM PEAK HOUR TRIP DISTRIBUTION .................................................................................................................................... 7 LIST OF FIGURES FIGURE 1 - PM PEAK HOUR PROJECT TRAFFIC ASSIGNMENT ................................................................................................................ 6 Page 1 INTRODUCTION This report summarizes the transportation concurrency analysis conducted for Sandhill Pines, a Neighborhood Infill Development. This analysis has been completed in accordance with Walton County Land Development Code (LDC) Appendix C.3 – Transportation Concurrency Management System Methodology and Procedures. PROPOSED LAND DEVELOPMENT PLAN The project is located along the west side of Mack Bayou Road approximately 1.15 miles north of the US Highway 98 / Mack Bayou Road intersection. There is one vehicular access connection to Mack Bayou Road. The proposed use of the property will be a Seventy-Eight (78) lot residential townhome subdivision. STUDY AREA Project traffic was assigned onto concurrency roadway segments within a half mile driving radius of the site. Figure 1 illustrates the study area. The study area is further described in the “Project Trip Distribution and Assignment” section of this report. Segments of the Walton County Transportation Concurrency Roadway Network within ½ mile driving range of the subject site include the following: Table 1 - Transportation Concurrency Roadway Network Segments Segment Road Section Segment Direction C0457.010-S Mack Bayou Rd E. Harborview Road (Turquoise E. Harborview Road (Turquoise Beach) SB Beach) to US 98 (SR 30) to US 98 (SR 30) C0457.010-N Mack Bayou Rd US 98 (SR 30) to E. Harborview US 98 (SR 30) to E. Harborview Road NB Road (Turquoise Beach) (Turquoise Beach) U098.080-E US 98 (SR 30) CR 187S (Sandestin Boulevard) to Sandestin Lane to CR 457 (Mack Bayou EB CR 457 (Mack Bayou Road) Road) U098.080-W US 98 (SR 30) CR 457 (Mack Bayou Road) to CR CR 457 (Mack Bayou Road) to WB 187S (Sandestin Boulevard) Sandestin Lane U098.090-E US 98 (SR 30) CR 457 (Mack Bayou Road) to CR CR 457 (Mack Bayou Road) to W. EB 30-A (West End) Hewitt Road U098.090-W US 98 (SR 30) CR 30-A (West End) to CR 457 W. Hewitt Road to CR 457 (Mack Bayou WB (Mack Bayou Road) Road) EXISTING PM PEAK HOUR TRAFFIC VOLUME CONDITIONS Information regarding roadway characteristics such as adopted level of service (LOS) standards, service volumes, existing counts, and committed trips were obtained from the Walton County Transportation Concurrency Management System. The following information obtained is pertinent to this traffic analysis: Page 2 Table 2 – CMS Traffic Data for Study Area Segments Max 2009 Existing Committed Peak Ex. + 3% Service Service Traffic Traffic Direction Available 2010 Cost Segment Committed Volume Volume PM (PM-P) (PM-P) Capacity Per Trip (PM-P) Threshold Peak Hour C0457.010-S 760 314 334 648 N/A 112 23 $3,610 C0457.010-N 760 340 372 712 PD 48 23 $3,610 U098.080-E 2,720 1,410 2,264 3,674 PD -954 82 $2,570 U098.080-W 2,720 1,302 2,057 3,359 -- -639 82 $2,570 U098.090-E 1,810 1,410 2,223 3,633 PD -1,823 54 $3,740 U098.090-W 1,810 1,302 2,167 3,469 -- -1,659 54 $3,740 ESTIMATE OF SITE GENERATED TRAFFIC To determine the number of proposed trips the project will generate, standard trip generation rates and equations from the Institute for Transportation Engineers (ITE) Trip Generation manual, Ninth Edition, were used. Table 3 presents the estimated proposed trip generation information for the PM peak hour for the proposed uses of the project site. This analysis details the additional trips generated by the proposed development. Page 3 Table 3 - PM Peak Hour Trip Generation - Proposed Uses Project Trip Generation PM Directional Distribution Internal Capture Unadjusted % Adjusted ITE Land Use Rate per Pk Hr EnteringExiting Entering Exiting External Trips New External Trips Code Land Use Description Size Units1,000 SF Fitted Curve Equation Trips % Trips % Trips % Trips % Trips Enter Exit Trips Enter Exit Total 230 Residential Condominium / Townhouse 78 Unit N/A Ln(T) = 0.82 Ln(X) + 0.32 49.03 67% 32.85 33% 16.18 0% 0.00 0% 0.00 32.85 16.18 100% 32.85 16.18 49.03 TOTAL 49 33 16 0 0 33 16 33 16 49 Page 4 PROJECT TRIP DISTRIBUTION AND ASSIGNMENT Mack Bayou Road is the closest roadway in the Walton County Transportation Concurrency Management System. Project traffic from the proposed development conditions were assigned onto the external roadway system based on knowledge of travel patterns in the area. As required for the transportation concurrency analyses, project traffic was distributed onto the roadway segments within a ½ mile driving radius of the access to the nearest concurrency system roadway. Figure 1 illustrates the project traffic assignments. This figure also illustrates the 3% volume thresholds of the segments just outside of the traffic study area to show that trips generated do not exceed this threshold. Page 5 Figure 1 - PM Peak Hour Project Traffic Assignment Page 6 ROADWAY SEGMENT ANALYSIS As required by the Walton County LDC for transportation concurrency analysis the project traffic was assigned and distributed to all roadway segments within ½ mile driving radius of each access point of the project. Table 4 below presents the estimated proposed trip distribution for the PM peak hour. Table 4 – PM Peak Hour Trip Distribution Peak Hr Adopted MSV @ Current Peak Total Proposed Project Remaining Direction Total Existing Proposed LOS LOS Peak Hr Direction Peak Less Traffic as Capacity Peak Segment # Road Segment Dir 2009 Avail Project Project Standar Hr Committed Hour Existing a % of After Direction? FDOT Capacity Traffic Traffic d Direction Trips Demand Traffic Capacity Project Counts Mack Bayou Rd. E. Harborview Road (Turquoise C0457.010-S Mack Bayou Rd Beach) to US 98 (SR 30) SB D 760 314 334 648 112 0 14 14 1.84% 98 US 98 (SR 30) to E. Harborview C0457.010-N Mack Bayou Rd Road (Turquoise Beach) NB D 760 340 372 712 48 0 32 32 4.21% 16 PD US 98 (SR 30) Sandestin Boulevard to Mack U098.080-E US 98 (SR 30) Bayou Road EB C 2,720 1,410 2,264 3,674 -954 0 18 18 0.66% -972 PD Mack Bayou Road to Sandestin U098.080-W US 98 (SR 30) Boulevard WB C 2,720 1,302 2,057 3,359 -639 0 7 7 0.26% -646 Mack Bayou Road to W. Hewitt U098.090-E US 98 (SR 30) Road EB C 1,810 1,410 2,223 3,633 -1823 0 7 7 0.39% -1830 PD W. Hewitt Road to Mack Bayou U098.090-W US 98 (SR 30) Road WB C 1,810 1,302 2,167 3,469 -1659 0 18 18 0.99% -1677 CONCLUSION This Transportation Concurrency Analysis was performed to assess the impact of the proposed Sandhill Pines – A Neighborhood Infill Development. The development is estimated to generate a total of 49 new trips during the PM peak hour. Currently US Highway 98 is over capacity. The development may be required to contribute into the Walton County Proportionate Fair Share system in order to meet traffic concurrency. Page 7 .