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Comprehensive Plan Transportation Element <br />Counts are most useful when compared to roadway capacity. Using a volume to capacity <br />measure (v/c), roadway level -of -service (LOS) can be determined. Table 4.7.1 and Figure 4.2.2 <br />identify peak hour roadway LOS on the county's roadway network. <br />Lane Geometry <br />The number of through lanes for each facility on the Indian River County roadway network is <br />summarized in Figure 4.2. As shown in that figure, I-95 is the only four lane expressway serving <br />the county. Other north -south travel is provided on US 1 and Indian River Boulevard, both of <br />which are four lane divided facilities. In the east -west direction, the widest road is SR 60, which <br />exists as a four and six lane roadway east of I-95. County Road 512 in the Sebastian area is also <br />four-laned, providing east -west travel in the northern portion of the county. <br />For planning purposes, a roadway's capacity and level -of -service (LOS) are generally based on <br />the number of through lanes. Level of Service (LOS) is a qualitative measure, describing <br />motorists' perceptions of operating conditions within a traffic stream. Capacity, on the other <br />hand, is a quantitative measure of the ultimate number of motor vehicles which can travel over a <br />particular roadway segment during a particular time period (either hourly or daily). These <br />conditions are generally described in terms such as speed and travel time, freedom to maneuver, <br />interruptions to traffic flow, comfort and convenience, and safety. <br />Levels of service are generally designated by letters A through F, with LOS A representing the <br />best operating conditions (free flow) and LOS F the worst (forced or breakdown flow). <br />Characteristics of each level of service are listed below: <br />LEVEL OF SERVICE A <br />- Uninterrupted flow <br />- No restriction on maneuverability <br />Few or no delays <br />LEVEL OF SERVICE B <br />Stable flow conditions <br />- Operating speed beginning <br />to be restricted <br />LEVEL OF SERVICE C <br />- Speed and maneuverability <br />restricted by higher traffic volumes <br />- Satisfactory operating speed <br />for urban conditions <br />- Delay at signals <br />Community Development Department <br />LEVEL OF SERVICE D <br />- Low speeds <br />- Mayor delays at signal <br />- Little freedom to maneuver <br />LEVEL OF SERVICE E <br />- Lower operating speeds <br />- Major delays and stoppages <br />-Volumes at or near capacity <br />LEVEL OF SERVICE F <br />- Low speeds <br />- Stoppages for long periods <br />because of downstream <br />congestion <br />Indian River County 12 <br />