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Comprehensive Plan Capital Improvements Element the project cannot be approved. The principal function of the concurrency management system then is to provide a mechanism whereby demand and capacity measures can be compared on a project by project basis. Table 6.16 provides the criteria for establishing a demand to capacity comparison for a proposed project. While most of the characteristics are self-explanatory, one needs clarification; that is the geographic scope for the traffic public facility category. For concurrency purposes, affected roadways are those roadways impacted by a project's traffic. Regardless of size, all projects impact the roadway on which the project fronts. In addition, other roadways further removed from the project may be impacted. For concurrency purposes, two lane roadways which are assigned 8 or more peak hour/peak season/peak direction project trips and four or more lane roadways that are assigned 15 or more peak hour/peak season/peak direction project trips are considered impacted roadways. For transportation concurrency related facilities, level -of -service standards are applied to all impacted roadways. Those level -of -service standards range from A to F and are associated with peak hour/peak season/peak direction trips. Demand Demand is an important component of the concurrency management system. Essentially, demand is a measure of facility use. When compared to facility capacity, demand can indicate the level -of -service for the facility. As depicted in Table 6.16, demand can be measured quantitatively for each public facility category. While the demand function for each facility consists of applying a rate to the number of facility users, estimation of total demand is more complex. For concurrency management purposes, demand can be divided into three types: existing, committed, and projected. Each must be considered separately for purposes of concurrency management. Existing Demand Existing demand is simply the current level of use for a facility. For a roadway, it is the number of peak hour/peak season/peak direction trips; for a school, it is the number of full-time enrolled students; for water and wastewater treatment plants, it is the existing flow volume measured in gallons per day. Those figures are included within applicable plan elements. Existing demand then reflects the use of a facility by the current population. When compared to capacity, existing demand can show if the facility has unused capacity or if it is functioning over capacity. Existing demand, however, is not static. As population increases and dwelling units come on-line, existing demand increases. Those increases in existing demand can be identified through facility use measurements. For example, regular traffic counts done on roads or treatment plant flow records are Community Development Department Indian River County Adopted -Dec . 1 , 2015, Ordinance 2015- 0I 42