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Comprehensive Plan Transportation Element Overall, the model validation process involved running the FSUTMS model to obtain predicted 2000-2010 roadway traffic volumes and then comparing those model -predicted roadway volumes to actual -2010 field -collected traffic counts. Based upon the comparison of predicted to observed volumes, minor changes were made to the model's parameters. This change in parameters allowed the model to approximate predicted roadway volumes to actual roadway volumes. Through this process, an acceptable projected -to -actual ratio was obtained. With this process complete, the model was then considered valid for the purpose of predicting future traffic levels using future -year socioeconomic data projections. • Needs Analysis The validated model was then run using 2030-2040 socioeconomic data and the existing and committed road network. This model run was performed to develop 2030 2040 traffic demand projections under the assumption that no capacity -producing roadway improvements would be made from 2010 2020 to 20382040. In other words, this model run assessed the impact of 20 years of growth on the existing and committed roadway network. This model run also identified roadway deficiencies resulting from the growth in travel demand over this 20 -year time period. A deficient roadway is defined as any roadway having a level of service condition that exceeds the adopted roadway performance standard. With this process, all deficient roadways became candidates for potential future road widening projects and were tested to determine whether improvements were needed to maintain the adopted level of service standards through the year 20382040. In terms of output, the traffic model projects future year traffic volumes on all major roads in the county. For each roadway on the network, the model uses the projected traffic volume ("v") for the road (produced by the model) and the maximum acceptable capacity ("c") of the road to transform each of these raw volume projections into more understandable volume to acceptable capacity ("v/c") ratio. If the v/c ratio exceeds 1.0, the traffic volume of a roadway segment is projected to exceed the acceptable capacity of that roadway segment. While a v/c of 1.0 indicates that the traffic volume is just at the acceptable level of service, a roadway with a v/c much less than 1.0 has excess traffic capacity. In the latter case, more traffic could be accommodated, and the road would still function at an adequate level of service. 2000 2039 40283 55962 23201 28917 Hotel 2135 3832 Hotel -Population 82973 33183 2135 159921 48557 3432 23673 38}44 Community Development Department 15625 23824 28044 42760 Indian River County 78 APPENDIX A — Transportation Amendments