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5.6 Roadway Level of Service <br />Roadway Level of Service (LOS) is a qualitative measure, describing motorists' perceptions of <br />operating conditions along a roadway. Roadway LOS is generally designated by letters A through <br />F, with LOS A representing the best operating conditions (free flow) and LOS F the worst (forced <br />or breakdown flow). <br />For Strategic Intermodal System (SIS)/Florida Intrastate Highway System (FIHS) roadways, the <br />County has adopted an LOS of "B" in the rural areas and an LOS of "C" in the urban areas. For <br />all other roadways, the County has adopted an LOS of "D" with the exception of the following, <br />which will operate at 20% in excess of level of service "E": <br />• 27th Ave — South County Line to SR 60 <br />• 43rd Ave — Oslo Road to 16th Street <br />Based on the latest available 2012 peak hour traffic counts, all roadways within the County are <br />operating at or above the adopted LOS. As part of the 2035 Long Range Transportation Plan <br />(LRTP) Update, the MPO identified future deficiencies on the roadway network and a cost <br />affordable set of improvements needed to accommodate future demand. The future deficiencies <br />were identified based on 2035 traffic projections overlaid on the existing plus committed (E+C) <br />roadway network, which reflects the existing roadway network plus improvements for which <br />construction funding has been committed over the next five years. <br />Based on those initial results, the County adopted the approach of developing a dense roadway <br />grid network as an alternative to roadway widening as the future transportation vision. A grid <br />network will increase travel route choices for shorter trips and reserve capacities on major roads <br />for longer distance trips. The final Needs Plan was developed based on a combination of grid <br />densification improvements and targeted capacity enhancements for US 1, SR 60, Indian River <br />Boulevard, Oslo Road and a few other major corridors. <br />In 2035, the majority of roadways are expected to operate at or above LOS "D", with many of the <br />roadways operating at or above LOS `B". As shown in Figure 6-4, a small number of roadways <br />are expected to operate below LOS "D." Those include 1-95 between SR 60 and the South County <br />Line; a section of SR AIA (17th Street -Vero Beach City Limits); parts of US 1 in the City of <br />Sebastian and in the South County; SR 60 between 1-95 and 66"` Avenue; and Oslo Road between <br />I-95 and 58`" Avenue. <br />5-8 <br />starftcomltwts m <br />i <br />