Laserfiche WebLink
Page 3 <br />kimley-horn.com 4637 Chabot Dr., Suite 300, Pleasanton, CA 94588 925-398-4840 <br />For existing conditions, AM (7-9) and PM (4-6) peak period traffic volumes were obtained from the <br />Caltrans Traffic Census Program2 or recent publicly accessible traffic studies conducted within the <br />Tri-Valley area. These traffic counts were then evaluated to determine the highest AM and PM peak <br />hours of traffic which is the basis of the analysis contained herein. Future 2040 No Build and 2040 <br />Build peak hour volumes were developed using post-processed data from a version of the CCTA <br />travel demand model updated to reflect input from the TVTC member jurisdictions. Further <br />information on the travel demand model’s development is provided within the 2020 TVTC Nexus <br />Study. Generally speaking, forecast volumes were developed using the “difference method”, which <br />involves adding forecasted traffic growth (future minus existing estimated traffic volumes from the <br />travel demand model) to an existing count. <br />In cases where a project is proposing a new roadway segment (C-4 Dublin Boulevard – North <br />Canyons Parkway Extension and C-5 El Charro Road Widening), a parallel roadway segment was <br />used as the basis for evaluating project need. <br />A minimum level of service standard of LOS F was used for roadway analyses. <br />Freeway <br />Freeway facilities were analyzed using the HCM 6th edition methodology for basic freeway segments. <br />As shown in Table 2, LOS is determined based on the density of traffic flow. <br />Table 2: Freeway Facility Level of Service Criteria <br />Level of <br />Service (LOS)Density (pc/mi/ln) <br />A ≤ 11 <br />B > 11 – 18 <br />C > 18 – 26 <br />D > 26 – 35 <br />E > 35 – 45 <br />F > 45 or v/c > 1.0 <br />pc/mi/ln = passenger car per mile per lane; v/c = volume-to-capacity <br />Source:Highway Capacity Manual, 6th Edition <br />State Route <br />State Route facilities were analyzed using the HCM 6th edition methodology for multi-lane roadway <br />segments. As shown in Table 3, LOS is determined based on density of traffic flow. <br />2 Caltrans,https://dot.ca.gov/programs/traffic-operations/census, Accessed March 2022.