SU0013451 - Laserfiche WebLink

Home Browse Search

4.2 TRAFFIC AND CIRCULATION "unbalanced" between the intersection legs, vehicles on the highest volume approach would experience disproportionate delays. At unsignalized intersections, "stop" or "yield" signs are used to assign the right-of-way to one street while controlling movements from the other street(s). This forces drivers on the controlled street-- usually the "minor street" approach to the intersection--to select "gaps" in the major street traffic flow through which they can enter and turn into the intersection,or cross through the intersection. Where the minor street is controlled by stop-signs,the LOS reflects delays experienced by that minor street traffic. Therefore,while an intersection's overall LOS may be C or better,a driver making a turn from the minor street could experience delay equivalent to LOS E to F. When through-traffic on the major street is relatively heavy,there are limited gaps in that traffic for vehicles entering from the minor street, resulting in longer delays. Typically, the greatest delays are experienced by drivers attempting to turn left from the minor streets onto the major street or travel directly across the major street. The quantitative measure of LOS at unsignalized intersections does not yield V/C ratios. The LOS is an estimate of the available "reserve capacity" of an approach to an intersection. (Supplemental information on level of service concept and definitions is provided in Appendix B.) On the basis of disetissions with San jeaquin County staff (Wellenhaupt, 1991), the following six On the basis of information supplied by San Joaquin County staff regarding average daily traffic volumes for select roadways(Wollenhaupt,1991),combined with proximity of intersections to the project site, proposed access points and potential haul routes, the following six intersections were selected for evaluation of current operational characteristics and determination of potential impacts due to the proposed project: 1. Lower Sacramento Road/Forest Lake Road (one-way stop control); 2. Peltier Road/Ray Road (two-way stop control); 3. Peltier Road/Davis Road (two-way stop control); 4. Lower Sacramento Road/Peltier Road (four-way stop control); 5. Davis Road/Turner Road (four-way stop control); and 6. Davis Road/State Route 12 (two-way stop control). Existing Intersection Operation Both AM and PM peak hour turning movement counts were conducted at the six study area intersections (Omni-Means,Ltd., 1991). From these counts,existing LOS ratings have been calculated and are shown in Table 4.2-1. Corresponding intersection locations and volumes are mapped on Figures 4.2-1 and 4.2- 2. Note that traffic volumes between adjacent intersections do not necessarily correspond or "balance." The traffic volume counts were conducted on several different days, therefore adjacent intersection 4.2-3