Laserfiche WebLink
Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 91 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />City of Redwood City Unsignalized Intersections <br /> <br />The City of Redwood City LOS methodology for unsignalized intersections is the 2010 Highway <br />Capacity Manual (HCM) method. The 2010 Highway Capacity Manual methodology estimates the <br />average control delay per vehicle in seconds. Control delay is the amount of delay that is attributed <br />to the particular traffic control device at the intersection and includes initial deceleration delay, queue <br />move-up time, stopped delay, and final acceleration delay. The average delay can then be correlated <br />to a level of service. The correlation between average control delay and LOS is shown in Table 4.16- <br />1, below. <br /> <br /> <br />Table 4.16-1: Unsignalized Intersection LOS Definition <br />LOS Description Average Control Delay <br />Per Vehicle (seconds) <br />A Little or no traffic delay 10.0 or less <br />B Short traffic delays 10.1 to 15.0 <br />C Average traffic delays 15.1 to 25.0 <br />D Long traffic delays 25.1 to 35.0 <br />E Very long traffic delays 35.1 to 50.0 <br />F Extreme traffic delays Greater than 50.0 <br />Source: Transportation Research Board. 2000 Highway Capacity Manual. 2000 <br /> <br /> <br />Unsignalized intersections in the City of Redwood City are said to operate acceptably, if the <br />intersection operates at LOS D or better. <br /> <br />4.16.1.5 Existing Conditions <br /> <br />The results of the LOS analysis under existing conditions are summarized in Table 4.16-2, below. <br />The results show that all study intersections are operating acceptably (LOS D or better). <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />7.A. - Page 122