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Comprehensive Plan Transportation Element service higher than "C" is not even achievable on roadways other than freeways and multi -lane highways that have few signals. Therefore, LOS "C" is the highest achievable level of service for roadways that carry most of the traffic in Indian River County. While "C" is in many—some instances possible to achieve, the County (as well as all of the municipalities in the county) have established "D" peak season/peak hour as the adopted level of service standard. Although level of service "D" implies acceptance of sub -standard roadway operating conditions, there is, in actuality, little difference to the user between roadway level of service "C" and "D". For example, the difference between LOS "C" and "D" on a typical arterial roadway with more than 2 signals/mile (such as US1 in Vero Beach) equates to an increase in travel speed of 4 miles per hour. From a traffic volume perspective, the differences between the service volumes of LOS "C" and LOS "D" may also be minimal. On a 4 -lane divided arterial with fewer than 2 signalized intersections per mile, the difference between LOS "C" and LOS "D" 4swas 50 peak - hour directional vehicles. Currently, many roadways in the county operate at LOS "D." This is true of most of the county's north -south roadways, which are generally spaced farther apart than east -west roadways. Currently, all of US 1 is operating at LOS "D", except for small segments adjacent to the St. Lucie County and Brevard County lines. In 2019, none of the links on the County roadway network are over their adopted LOS capacity, with the exception of 37th Street and the CR 510 Segments as described below, even when including vested traffic. Further, only 23 of 465 roadway links (or 5%) of the roadway network is at 80% capacity. 80 links, or 17% of the roadway network, are at 20% capacity. These links are operating at the equivalent of LOS "A" or "B", depending on their individual classifications. The majority of the roadway network in Indian River County is operating at LOS "C" or better in accordance with 2012 FDOT Level of Service Standards. Some of the major roadways operating at LOS "D" include Indian River Boulevard in the City of Vero Beach; Old Dixie Hwy from 4th St to 12th St; 20th Ave from 4th St to 12th St; 27th Ave from the South County Line to Aviation Blvd; 43`d Ave from Oslo Rd to 26th St; 58th Ave from 41st St to 49th St; 8th St from 20th Ave to Old Dixie Hwy; and 16th St from 20th Ave to Old Dixie Hwy. As shown in Figure 4.2.2, two roadways, 37th Street (U.S. 1 — Indian River Boulevard) and CR510 (66th Ave to U.S. 1) have slightly exceeded LOS "D". Major capacity improvements are planned and at least partially funded for those improvements and an interim LOS of "D+20%" has been adopted for these roads until completion for major capacity improvements. on the MPO's 2030 Long Range Plan (such as US 1 from 12 Plan: Community Development Department Indian River County 73 APPENDIX A — Transportation Amendments