Okaloosa County BOCC — 2013 meeting #1140 (date undetermined) — Nature Lake Traffic Analysis — reading text

Transportation Concurrency Analysis Nature Lake Okaloosa County, Florida September 26, 2012 David E. Smith, P.E. P.E. No. 58927 Introduction The proposed Nature Lake project is located on the north side of Lake Silver Road approximately 0.68 miles west of State Road 85 in unincorporated Okaloosa County, Florida. Access to the project is provided directly to Lake Silver Road and to Dogwood Drive (which also connects to Lake Silver Road). The project consists of 160 single family detached dwellings. A vicinity map is provided on Figure 1. Existing and Committed Traffic Traffic data for existing conditions was obtained from the Florida Department of Transportation (FDOT) and Okaloosa County. The FDOT traffic count data was released in June 2012 and represent counts collected in 2011. The Okaloosa County count data was recently obtained and represents counts collected in 2010. For purposes of this analysis, the daily (average annual daily traffic, or AADT) traffic counts were converted to peak season, peak hour conditions in order to perform a directional analysis for state roadways and a two-way analysis for county roadways. The conversion factors used for this conversion are the K and D factor data provided by FDOT. The factor data used in this analysis is shown in Exhibit 1 of this report. Roadway level of service (LOS) standard information was obtained from the Okaloosa County Comprehensive Plan. Information regarding roadway characteristics such as area type, facility type, and were obtained from the Okaloosa-Walton Transportation Planning Organization Adopted Congestion Management System report, dated February 2012. Okaloosa County provided traffic data for committed projects (those projects that have been approved but not yet built) as of December 2010. This committed traffic data was used in the roadway segment level of service analysis. Trip Generation To determine the number of trips the proposed project will generate, the standard trip generation equation from the Institute for Transportation Engineers (ITE) Trip Generation manual, Eighth Edition, was used. Trip generation for the PM peak hour is provided in Table 1. Trip Distribution Project traffic was assigned onto the external roadway system using existing traffic patterns and local knowledge of the area's potential origins and destinations and trip lengths. The project traffic distribution can be found in Figure 2. Nature Lake Transportation Concurrency Analysis 1 Figure 1 Vicinity Map SITE Driving Directions: From the US 90 / SR 85 intersection travel north along SR 85 N approximately 3.24 miles; Turn left on Lake Silver Road and travel west along Lake Silver Road approximately 0.68 miles. The property is located along the north side of Lake Silver Road. Nature Lake Transportation Concurrency Analysis 2 Table 1 PM Peak Hour Project Trip Generation PM Development Peak Enter/Exit Enter/Exit Type Size Equation Trips Split Trips ITE Code 210 Ln(T) = 63% enter 101 enter Single Family 160 du 160 0.90 Ln(X) + 0.51 37% exit 59 exit Detached Housing Nature Lake Transportation Concurrency Analysis 3 Nature Lake Transportation Concurrency Analysis 4 Level of Service Analysis The level of service analysis may be found in Table 2 for State roads and Table 3 for County roads. Peak hour service volumes were determined using generalized tables from the Florida Department of Transportation (FDOT) Level of Service Manual. As indicated in Table 2, State Road 85 and Airport Road are projected to have traffic that may potentially exceed the maximum service volumes found in the FDOT Generalized Tables. The potentially over-capacity segments on these roadways are existing deficiencies and are not caused by the proposed project. With regard to the Airport Road segment, the roadway currently operates at only about 40% of its LOS D maximum service volume, but the analysis indicates that the roadway is potentially over capacity due to committed traffic. In fact, committed traffic accounts for over 60% of the roadway’s LOS D maximum service volume, with the River Park PUD Master Plan consuming the largest share (454 trips) of the committed traffic. Given the long-range and uncertain nature of that project, Airport Road will continue to operate with considerable available capacity remaining for an extended period. In order to mitigate the project’s impact upon the roadway system, the applicant proposes to enter into a developer’s agreement with Okaloosa County. One mitigation measure that the applicant proposes to take is to provide a deceleration lane on Lake Silver Road at the project entrance location. While the project traffic does not meet the numeric warrant criteria for the installation of a right turn lane, such a lane is proposed in order to reduce the delay for westbound drivers on Lake Silver Road, as that is the peak direction of travel in the afternoon period. Nature Lake Transportation Concurrency Analysis 5 Table 2 Concurrency Level of Service Analysis for State Roads PM Peak Hour Conditions Nature Lake 101 enter 59 exit PM Project PM Pk 2011 count Existing Peak Exist + Project Total Remaining Traffic Segment Pk Service FDOT Peak Hr Commit Commit Traffic Project Future Service as a % of Road From To Dir Dir Volume Site # AADT K D Dir Traffic Traffic Traffic Assign Traffic Traffic Volume Service Vol SR 85 Stillwell Blvd Old Bethel SB 1,800 1603 21,000 0.0900 0.5260 896 895 1,791 52% 31 1,822 (22) 1.7% NB PD 994 1,503 2,497 52% 53 2,550 (750) 2.9% Old Bethel End of 4-lane SB 2,420 0138 * 4,400 0.0950 0.5850 173 761 934 89% 53 987 1,433 2.2% NB PD 245 1,256 1,501 89% 90 1,590 830 3.7% End of 4-lane County Line SB 430 0051, 0054, 0118, 3,638 0.0950 0.5850 143 761 904 9% 9 914 (484) 2.1% NB PD 0138, 0356T ** 202 1,256 1,458 9% 5 1,463 (1,033) 1.2% US 90 Antioch Road W Crestview City Limits EB 1,800 1602, 0122T *** 14,833 0.0900 0.5260 633 200 833 4% 4 837 963 0.2% WB PD 702 204 906 4% 2 909 891 0.1% E Crestview City Limits Fairchild Rd EB PD 3,130 1601 11,000 0.0900 0.5260 521 99 620 2% 1 621 2,509 0.0% WB 469 179 648 2% 2 650 2,480 0.1% * Station 570138 is approximately 2.0 miles north of this segment, but is the most similar station in terms of observed traffic volume for this segment ** Stations on this segment: 0051 3600 0054 3400 0118 3000 0138 4400 0356T 3790 *** Stations on this segment: 1602 17000 0122T 12666 Nature Lake Transportation Concurrency Analysis 6 Table 3 Concurrency Level of Service Analysis for County Roads PM Peak Hour Conditions Nature Lake 160 Existing Project Adopted PM Pk Daily PM Two-Way Existing + Project Two-Way Total Remaining Traffic Segment LOS Service Traffic Axle Seasonal K Peak Committed Committed Traffic Project Future Service as a % of Road From To Dir Std Volume (Unadjusted) Factor Factor Factor Traffic Traffic Traffic Assign Traffic Traffic Volume Service Vol Old Bethel Rd/CR 188 SR 85 US 90 EB D 1,460 6,314 0.94 0.95 0.0900 507 342 849 14%