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Comprehensive Plan Transportation Element Roadway Alternatives An analysis was performed of:r:tt he imct of ee-laninand 27thAvenues. According to the Gof Service Tables contained in FDOT's 2002 Quality/Level of Service Handbook, dividing an undivided facility generally results in a 5% increase in capacity. Applying this increase to the two lane capacity of 43m Avenue, three-laning these facilities would result in a new capacity of approximately 903 vehicle trips/hour/direction. While helping to mitigate level of service concerns, this solution alone does not fully address these concerns, since peak hour directional demand from proposed traffic projects on 43rd Avenue (921 trips) will soon exceed three -lane capacity (903 trips). Nonetheless, three-laning is considered part of the near-term solution and will be implemented in lieu of five-laning. 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 preliminary 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 will still result in level of service deficiencies on 27th and 43rd Avenues. Another roadway alternative that was explored 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 will also not adequately address level of service 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 20th 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 is exploring new alignments and other alternatives to address the 43rd Avenue and 27th Avenue level of service considerations. Preliminary model analysis indicates 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 Community Development Department Indian River County 14