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peak hour and affecting the peak direction of impacted roadways. According to ITE, the proposed use generates more volume in the p.m. peak hour than in the a.m. peak hour. Therefore, the p.m. peak hour was used in the transportation concurrency analysis. The peak direction during the p.m. peak hour on SR 60 is westbound. Given those conditions, the number of peak hour/peak season/peak direction trips that would be generated by the most intense use of the subject property under the existing land use designation was calculated to be 87. This was determined by multiplying the total number of units allowed (166) under the existing land use designation by ITE's factor of 1.01 P.M. peak hour trips/unit, to determine the total number of trips generated. Of these trips, 65% (109) will be inbound and 351k (58) will be outbound. Of the inbound trips, 80% or 87 will be westbound. To determine the number of peak hour/peak season/peak direction trips that would be generated by the most intense use of the subject property under the proposed land use designation, the total number of units allowed under the proposed amendment (242) was multiplied by ITE's factor of 1.01 p.m. peak hour trips/unit to determine the total number of trips generated (244). Of these trips, 65% (159) will be inbound and 35% (85) will be outbound. Of the inbound trips, 80% or 127 will be westbound. Therefore, the most intense use of the subject property under the proposed land use designation would generate 40 (127 - 87 = 40) more peak hour/peak season/peak direction trips than the 87 that would be generated by the most intense use of the subject property under the existing land use designation. Using a modified gravity model and a hand assignment, the peak hour/peak season/peak direction trips generated by the proposed use were then assigned to impacted roads on the network. Impacted roads are defined in section 910.09(4)(b)3 of the county's LDRs as roadway segments which receive five percent (5%) or more of the project traffic or fifty (50) or more of the project trips, whichever is less. Capacities for all roadway segments in Indian River County are calculated and updated annually, utilizing the latest and best available peak season traffic characteristics and applying Appendix G methodology as set forth in the Florida Department of Transportation Level of Service Manual. Available capacity is the total capacity less existing and committed (vested) traffic volumes; this is updated daily based upon vesting associated with project approvals. Based on the modified gravity model and the hand assignment, the roadway segment on the county roadway concurrency network that is most impacted by residential development on the subject property is SR 60, from 66th Avenue to 82nd Avenue. That segment will receive 17 of the 127 peak hour/peak season/peak direction trips generated. The traffic capacity for the segment of SR 60 most impacted by this request is 3,110 trips (peak hour/peak season/peak direction) at Level of Service (LOS) "D", while the Total segment Demand (existing traffic volume + vested traffic volume) on that segment of SR 60 is 2,065 trips (peak hour/peak season/peak direction). The additional 17 peak hour/peak season/peak direction trips created by the most intense use of the subject property under the proposed amendment would increase the total peak hour/peak season/peak direction trips for that segment of SR 60 to approximately 2,082. Based on the above analysis, staff determined that SR 60 and all other impacted roads can accommodate the additional trips without decreasing their existing levels of service. The table below identifies each of the impacted roadway segments associated with the proposed land use designation. As indicated in this table, there is sufficient capacity in all of the segments to accommodate the projected traffic associated with the request. TRAFFIC CONCURRENCY DETERMINATION Impacted Road Segments (peak hour/peak season/peak direction) BOOK 99 f'AU 740. NOVEMBER 12, 1996 55