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Comprehensive Plan Transportation Element than 2 signals/mile (such as US 1 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" is 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 2006, approximately 20% of the County's roadways operated at LOS "D". These roadways, however, accounted for an estimated 50% of all travel in the county. Some of the major roadways operatinat LOS "D" include Indian River Boulevard in the City of Vero Beach; Old Dixie Hwy from 4t St to 12th St; 20th Ave from 4th St to 12th St; 27th Ave from the South County Line to Aviation Blvd; 43rd 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. Several other roadways, including significant portions of CR 512, SR 60, and Oslo Road, also operate at LOS D, but have improvements underway or programmed in the five-year work program. If the county were to adopt LOS "C" as its standard, the county would need to widen all roadways now operating at LOS "D". The cost of those widenings would greatly exceed existing and anticipated transportation resources. In fact, widening just those roads that are not on the MPO's 2030 Long Range Plan (such as US 1 from 12th Street in Vero Beach to Schumann Drive in Sebastian) would add an estimated $200,000,000 to the cost of the MPO's Long Range Plan. To promote economic development, improve air quality, and improve mobility for all of its citizens, the county should adopt the highest possible level of service that is practical given the existing conditions on the roadway network. Since large portions of the system already operate at level of service "D" and since there is very little perceptual difference between "C" and "D" on several classifications of roadways, the county should not attempt to raise its overall level of service standard to "C". • Roadway Levels of Service In Indian River County, construction is underway or scheduled to begin shortly on a number of major road projects, including widenings on CR 512; Oslo Road; 66th Avenue; SR 60; and US1. When complete, these projects will forestall any additional LOS deficiencies on those roads through the near term. These capacity increases were made possible by a substantial increase in traffic impact fees imposed in 2004, by extension of the 1 cent local option sales tax, and by public/private coordination in constructing transportation improvements. The county has not, however, imposed other transportation revenue sources, such as the ELMS five cent local option gas tax. Over the past decade, demand exceeding supply alone does not account for all of the decreases in LOS in the county With the publication of the (2002) FDOT Quality and Level -of -Service Community Development Department Indian River County 52