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TYPE OF FACILITY - T T.I. {1p-Year} <br /> Minor residential streets and cul-de-sacs. 4 <br /> Average residential streets. 4.5 <br /> Residential collectors and minor or secondary <br /> collectors. 5 <br /> Major or primary collectors providing for <br /> traffic movement between minor collectors <br /> and major arterials. 6 <br /> Farm-to-market roads providing for the <br /> movement of traffic through agricultural <br /> areas to major arterials. 5 -- 7 <br /> Commercial roads (arterials serving areas <br /> which are primarily commercial in nature) . 7 - 9 <br /> Connector roads (highways and arterials <br /> connecting two areas of relatively high <br /> population density) . 7 - 9 <br /> Major city streets and thoroughfares and <br /> county highways. 7 - 9 <br /> Streets and highways carrying heavy truck <br /> traffic. This would include streets in <br /> heavily industrialized areas . 9+ <br /> For subdivision traffic only, it is permissible to use the chart <br /> shown in Figure 2. This chart relates Traffic Index to the number <br /> of houses served. It should be emphasized that this chart applies <br /> only to residential and collector streets. Streets carrying other <br /> traffic through the subdivision and streets going by a commercial <br /> area should not be analyzed by a house count chart. <br /> Prior to the use of this chart, the engineer should consult with <br /> the area planners as to future plans for temporarily dead-ended <br /> streets. Many times either commercial developments tie into <br /> residential collectors, or the collectors are extended to serve <br /> much larger areas. <br /> The chart is based upon each residence generating an average eight <br /> trips per day. Truck traffic is assumed to be three percent of <br /> the subdivision traffic. The truck traffic is assumed to consist, <br /> almost exclusively, of 2-axle and 3--axle vehicles. Truck constants <br /> _g_ <br />