Okaloosa County BOCC — July 2, 2013 (meeting #1140) — reading text

deceleration plus conservative two-minute stacking storage length requirements for the left turn lane total 630 feet. The existing left turn lane is approximately 680 feet in length. Therefore, the existing left turn lane is adequate to accommodate the increase in traffic. Nature Lake Transportation Concurrency Analysis 8 Packet Pg. 29  Figure 3 Right Turn Lane Analysis Location: Westbound Right Turn into Project from Lake Silver Road Project: Nature Lake Guideline for determining the need for a major-road right-turn bay at a two-way stop-controlled intersection. INPUT Roadway geometry: 2-lane roadw ay 200 Right-Turn Volume, veh/h Variable Value 180 Add right - turn bay Major-road speed, mph: 35 160 Major-road volume (one direction), veh/h:* 550 140 Right-turn volume, veh/h: 100 120 100 80 OUTPUT Do not add right - turn bay 60 Variable Value 40 Limiting right-turn volume, veh/h: 145 20 Guidance for determining the need for a major-road right-turn bay for a 2-lane roadway: 0 200 300 400 500 600 700 800 900 1000 1100 1200 Do NOT add right-turn bay. Major-Road Volume (one direction), veh/h source: Evaluating Intersection Improvements: An Engineering Study Guide NCHRP Report 457 *note minimum volume of 250 for marker to indicate on chart. Posted speed is 30 mph Major road background volume estimated based on existing development + trips from committed projects as of December 2010 Nature Lake Transportation Concurrency Analysis 9 Packet Pg. 30  Figure 4 Turn Lane Dimensions Nature Lake Calculations Based on FDOT Guidelines Intersection NB Right from SR 85 onto Lake Silver Rd Scenario PM Peak Hour Date 7/26/2012 General Information: Turn Lane Type Left Approach NB Traffic Control Type Unsignalized Time of Day PM Number of Lanes 1 Geometric Conditions Rural Design Speed 60 mph Turn Lane Parameters: Vehicle Length 25 feet Peak Cycle Factor 30 Turning Traffic Volume 250 Storage: 2-Minute Stacking During Peak 15 Minutes 8.33 vehicles Total 2-Minute Stacking Needed 225 feet (rounded up to whole vehicles) Minimum Required Storage N/A Number of Turn Lanes 1 Design Storage Length per Lane 225 feet Deceleration: Taper 50 feet Total Deceleration Distance 405 feet Total Turn Length (including Taper) 630 feet Nature Lake Transportation Concurrency Analysis 10 Packet Pg. 31 Conclusion A traffic impact analysis was conducted for the proposed Nature Lake project, which will be located on the north side of Lake Silver Road approximately 0.68 miles west of State Road 85 in unincorporated Okaloosa County, Florida. The following is a summary of the findings and observations of this report:  The existing northbound left turn lane on State Road 85 turning left onto Lake Silver Road appears long enough to accommodate the proposed future traffic including this project.  The project access location on Lake Silver Road does not meet requirements for a left turn lane or a right turn lane. As a mitigation measure, however, the project proposes a right turn deceleration lane into the project to reduce delay for Lake Silver Road drivers traveling west, which is the afternoon peak direction.  Portions of State Road 85 and Airport Road are projected to be deficient prior to the addition of project traffic. The applicant proposes to address mitigation with a developers agreement with Okaloosa County. Nature Lake Transportation Concurrency Analysis 11 Packet Pg. 32  Exhibit 1 Supporting Data Packet Pg. 33 21-Feb-2012 16:55:02 Page -218- of -367- 555RPT [1,0,0,2] 3_57_AXWOY.txt 2011 Weekly Axle Factor Category Report - Report Type: ALL County: 57 - OKALOOSA Week Dates 5713 5714 5716 5717 SR397 SR20,SR397 - WALT.CO OKALOOSA RURAL OKALOOSA URBAN 1 01/01/2011 - 01/01/2011 1.00 0.98 0.94 0.99 2 01/02/2011 - 01/08/2011 1.00 0.98 0.94 0.99 3 01/09/2011 - 01/15/2011 1.00 0.98 0.94 0.99 4 01/16/2011 - 01/22/2011 1.00 0.98 0.94 0.99 5 01/23/2011 - 01/29/2011 1.00 0.98 0.94 0.99 6 01/30/2011 - 02/05/2011 1.00 0.98 0.94 0.99 7 02/06/2011 - 02/12/2011 1.00 0.98 0.94 0.99 8 02/13/2011 - 02/19/2011 1.00 0.98 0.94 0.99 9 02/20/2011 - 02/26/2011 1.00 0.98 0.94 0.99 10 02/27/2011 - 03/05/2011 1.00 0.98 0.94 0.99 11 03/06/2011 - 03/12/2011 1.00 0.98 0.94 0.99 12 03/13/2011 - 03/19/2011 1.00 0.98 0.94 0.99 13 03/20/2011 - 03/26/2011 1.00 0.98 0.94 0.99 14 03/27/2011 - 04/02/2011 1.00 0.98 0.94 0.99 15 04/03/2011 - 04/09/2011 1.00 0.98 0.94 0.99 16 04/10/2011 - 04/16/2011 1.00 0.98 0.94 0.99 17 04/17/2011 - 04/23/2011 1.00 0.98 0.94 0.99 18 04/24/2011 - 04/30/2011 1.00 0.98 0.94 0.99 19 05/01/2011 - 05/07/2011 1.00 0.98 0.94 0.99 20 05/08/2011 - 05/14/2011 1.00 0.98 0.94 0.99 21 05/15/2011 - 05/21/2011 1.00 0.98 0.94 0.99 22 05/22/2011 - 05/28/2011 1.00 0.98 0.94 0.99 23 05/29/2011 - 06/04/2011 1.00 0.98 0.94 0.99 24 06/05/2011 - 06/11/2011 1.00 0.98 0.94 0.99 25 06/12/2011 - 06/18/2011 1.00 0.98 0.94 0.99 26 06/19/2011 - 06/25/2011 1.00 0.98 0.94 0.99 27 06/26/2011 - 07/02/2011 1.00 0.98 0.94 0.99 28 07/03/2011 - 07/09/2011 1.00 0.98 0.94 0.99 29 07/10/2011 - 07/16/2011 1.00 0.98 0.94 0.99 30 07/17/2011 - 07/23/2011 1.00 0.98 0.94 0.99 31 07/24/2011 - 07/30/2011 1.00 0.98 0.94 0.99 32 07/31/2011 - 08/06/2011 1.00 0.98 0.93 0.99 33 08/07/2011 - 08/13/2011 1.00 0.98 0.93 0.99 34 08/14/2011 - 08/20/2011 1.00 0.98 0.93 0.99 35 08/21/2011 - 08/27/2011 1.00 0.98 0.93 0.99