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Comprehensive Plan Transportation Element results in a 5% increase in capacity. Applying this increase to the two lane capacity of 43rd Avenue found that three-laning would result in a new capacity of approximately 903 vehicle trips/hour/direction. While the three-laning would help to mitigate level of service problems, it was found that that improvement would not fully address level of service concerns, since peak hour directional demand from proposed traffic projects on 43rd Avenue would soon exceed three - lane capacity (903 trips). With respect to new roadways and parallel roadways, a number of north/south facilities exist within a distance of approximately five miles of 43rd and 27th Avenues. Two of these facilities (US 1 and Old Dixie Highway) connect residents in both Indian River and St. Lucie counties, while two others (58th Avenue and 20th Avenue) are limited to only Indian River County. In analyzing improvement options for north/south alternatives, it was determined that widening parallel facilities is either not feasible and/or will not result in adequate levels of service on 43rd and 27th Avenues. According to model runs performed as part of the MPO's 2030 Long Range Transportation Plan update, the widening of US 1 from four to six lanes would still result in level of service deficiencies on 27th and 43rd Avenues. Consequently, another roadway alternative was explored. That was the extension of 58th Avenue to Indrio Road in St. Lucie County. Located approximately 1 mile west of 43rd Avenue, 58th Avenue is a new, four lane divided north -south facility. According to modeled output, extending 58th Avenue south to Indrio Road in St. Lucie County would also not adequately address level of service issues on 43rd and 27th Avenues. The remaining north -south roadways, 20th Avenue and Old Dixie Highway, are severely constrained by right of way. Both roadways are also classified as collectors, whereas 27th and 43rd Avenues are classified as minor arterials. In addition, land use adjacent to 201h Avenue includes several public and private schools and school crossing zones. Consequently, neither facility can be widened without massive disruption to neighborhoods and businesses; therefore, neither option is cost feasible. No other parallel facilities exist within the corridor. Since the surrounding neighborhoods are largely built out north of Oslo Road, no new parallel roads could be built without displacement of existing neighborhoods. In the course of preparing its 2030 LRTP, the MPO explored other alternatives to address the 43rd Avenue and 27th Avenue level of service considerations. Model analysis indicated that a major new roadway corridor, 66th Avenue (modeled as a new, five -lane facility from SR 60 to Oslo Road and as a new three -lane facility from Oslo Road to St. Lucie County) could relieve conditions on 43rd Avenue if developed in conjunction with other alternatives (including the six- laning of US 1 and the 3-laning of 27th and 43rd Avenues). As indicated in the LRTP report, this relief would come about in year 2030, after all parallel and feeder routes are already constructed, and only if the MPO's future assumptions on growth and travel demand are realized. Community Development Department Indian River County 70