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<br />o LOS S A II Y <br /> <br />OF <br /> <br />TEll M S <br /> <br />AllTEJlIAL: Class of street serving major movement of trafUc not served by <br />freeways. <br /> <br />AVEIIAOE DAILY TJlAFFIC (ADT): The average number of vehicles pass1ng a <br />specified point during a 24-hour period. <br /> <br />CAPACITY: The maximum number of vehicles that can pass over a given section of <br />a lane or roadway in ene direction (or in both directions for a two- <br />lane or three-lane highway) during a given time period under <br />prevailing roadway and traff'1c conditions. It is the maximum rate <br />Of flow that has a reasonable expectation of occurring. Ther terms <br />"capaCity" and "possible" capacity are synOllymous. In the absence <br />of a time modifier, capaCity is an hourly volume. The capacity <br />would not normally be exceeded without changing one or more of the <br />conditions that preva11. In expressing capacity, it is essential to <br />state the prevailing roadway and traffic cOlldition under which the <br />capacity is applicable. More deta11 is provided in the "Highway <br />Capacity Manual". <br /> <br />COUNT: A volume counted on the street, which may be used for comparison with <br />the present traffic volume assigned to the corresponding link. The <br />count may be directional or total two-way, peak hour - morning and/or <br />aftemoon and/or a 24-hour value. <br /> <br />FREEWAY: A divided arterial highway designed for the s.afe unimpeded movement <br />of large volumes of traffic with full centro1 of access and grade <br />separations at intersections. <br /> <br />HIGHWAY SYSTEM: The network of streets which carry the vehicles throughout <br />local, arterial, ramp and f'reeway type fac11ities. <br /> <br />LEVEL OF SERVICE: The term used to indicate 1;he quality of service provided by <br />a facility under a given set of operating conditions. <br /> <br />LOCAL STREET: A street intended only to provide access to abutting properties. <br /> <br />PEAK HOUR: That one-hour period during which the max1mum amount of travel <br />occurs. Generally there 1s a morning peak and an aftemoon peak. <br /> <br />PEAK PEIIIOD: The two consecutive AM or PM 6D-minute periods which collectively <br />contain the maximum amount of AM or PM travel. Peak period can <br />be associated with person-trip movement, vehicle trip movement or <br />transit trips. <br /> <br />STUDY AREA: The area delimited for the purpose of data collection by a <br />transportation study. This area contains the central city and <br />surroundings which will become urbanized in 20 to 30 years and is <br />the area for which forecasts of travel are IIIade. <br /> <br />~ <br />~ <br />