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7.D. - Page 77 of 126 Redwood City Rezoning February 7, 2019 Methodology This section describes the methods used to determine the traffic conditions. It includes the methods used for level of service calculations and describes the level of service standards, as well as the criteria for project impacts. The methodology for level of service in this report is the same as the level of service in the Redwood City General Plan EIR, which bases LOS for roadway segments on vehicle density ranges. To determine the additional traffic added to the roadway network from the proposed rezoning, the number of trips generated by the proposed number of additional dwelling units were added to study roadway segments based on existing travel patterns. Road Segment Level of Service Level of service (LOS) describes the operating conditions experienced by motorists. LOS is a qualitative measure based on a number of factors, including speed and travel time, traffic interruptions, freedom to maneuver, driving comfort, and convenience. LOS is designated "A" through "F" from best to worst, which covers the entire range of traffic operations that might occur. LOS "A" through "D" generally represent traffic volumes at less than capacity, LOS "E" represents traffic volumes at capacity, and LOS "F" represents traffic volumes over capacity. This study evaluated LOS for road segments to determine the performance of the existing street system. The same evaluation can be conducted for intersections; however, intersection LOS is generally more applicable to project -level traffic analyses where traffic is sufficiently focused to justify a more precise level of evaluation. Road Segment Level of Service Standards and Impact Criteria The City of Redwood City standard for roadways is LOS D for roadways that are not downtown or part of the Congestion Management Program (CMP) network. Roadways located in downtown Redwood City have a standard of LOS E. Roadways part of the CMP network have varying standards, depending on the segment. For roadway segments, LOS is based on two-way peak hour volumes which provide a general representation of traffic operations and flow along a segment. Table 3 shows the criteria for LOS on roadway segments. In Redwood City, facilities registering LOS E or LOS F would be considered as operating at an unacceptable level. The City of Redwood City's General Plan considers a project to have a significant impact if either of the following happen: Cause an increase in traffic that is substantial in relation to the existing traffic load and capacity of the street system, a. Cause a roadway segment that currently operates at LOS D or better to degrade to LOS E or LOS F. b. Increase roadway volumes by more than five (5) percent at roadways that currently operate at LOS E or LOS F. 678