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§5-6 Traffic Impact Studies Model Land Use Management Code Horizon Year: Unless otherwise specified or approved by the Land Use Officer, the horizon year shall be twenty years into the future from the year during which a traffic impact study is being prepared. Internal trips: Trips that are made within a multi -use or mixed-use development, by vehicle or by an alternate mode, such as walking. Level of Service (LOS): A quantitative and qualitative measure of how well traffic flows on a given street or highway. Level of Service relates to such factors as highway width, number of lanes, percentage of trucks, total traffic volume, turning movements, lateral clearances, grades, sight distance, capacity in relation to volume, travel speed and other factors which affect the quality of flow. Level of Service is typically summarized by letter grades described as follows: Level "A" is a condition with low traffic volumes, high speeds and free-flow conditions. Level "B" is a condition with light traffic volumes, minor speed restrictions and stable flow. Level "C" is a condition with moderate traffic volumes, where speed and maneuvering are restricted to a limited degree by the amount of traffic. Level "D" is a condition with heavy traffic operating at tolerable speeds, although temporary slowdowns in flow may occur. Level "E" is a condition of very heavy flow and relatively low speeds. Under Level "E" the traffic is unstable and short stoppage may occur. Level "F" is a condition of extremely heavy flow, with frequent stoppage and very slow speeds. It is an unstable traffic condition under which traffic often comes to a complete halt. New trips: Total vehicle trips, minus pass -by trips, minus internal trips, if applicable. Pass -by trips: Vehicle trips which are made by traffic already using the adjacent roadway and entering the site as an intermediate stop on the way to another destination. Peak hour: 7:00 a.m. to 8:00 a.m., or 8:00 a.m. to 9:00 a.m. or the highest four fifteen minute increments within such time period for the a.m. peak hour; 4:00 p.m. to 5:00 p.m., 5:00 p.m. to 6:00 p.m. or the highest four fifteen -minute increments within such a time period for the p.m. peak hour. Peak -hour trip generation study: A study by a qualified professional of one or more actual developments of similar land use and development characteristics which provides empirical data on the actual number of trips entering and exiting said development(s) during the a.m. and p.m. peak hour. A peak -hour trip generation study shall consist of a.m. and p.m. peak hour traffic counts by direction (entering and exiting) on at least three separate weekdays if the study is based on only one similar development, or at least one a.m. and p.m. traffic count for three different actual developments. The results of actual traffic counts from peak -hour trip generation studies may be adjusted to discount pass -by trips as provided in this Resolution [Ordinance]. Professionally accepted: Published by the Institute of Transportation Engineers, or prepared by a qualified professional under work supervised by the County [City], or prepared by a qualified professional and accepted by the Land Use Officer. Qualified professional: For purposes of conducting traffic impact studies as may be required by this Ordinance, a qualified professional shall mean a registered professional engineer with experience in traffic engineering. For purposes of conducting peak hour trip generation studies, a qualified professional shall mean a registered professional engineer with experience in traffic engineering, or another professional approved by the Land Use Officer based on education and experience to conduct such trip generation studies. 2 P155