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ENCLOSURE <br /> HIGHWAY DESIGN MAN LIAI <br /> 400-27 <br /> November 1,2001 E <br /> Figure 407E is the template for the <br /> TOPIC 407 - Truck and BUS <br /> AASHTO Bus Design Vehicle turning on a <br /> Turning Templates 12.8-meter radius. <br /> Figures 407A through E are turning templates at an <br /> approximate scale of 1:500 for the three types of <br /> design vehicles described in Topic 404. A <br /> computer model of truck offtracking generated <br /> these"hard copy"templates. The printed templates <br /> can be used as overlays to evaluate the adequacy of <br /> the geometric layout of a curve when reproduced <br /> on clear film and scaled to match the highway <br /> drawings. The lines on the template delineate the <br /> path of the wheels and the body of the vehicle as <br /> the truck moves through the tum. These lines must <br /> clear any "obstacles" including curbs, islands, <br /> adjacent lanes, sign structures, traffic delineators, <br /> traffic signal and lighting poles, guardrails, trees <br /> and rock outcrops. <br /> If any 'obstacles" are encroached by the vehicle <br /> path on the template,-then an alternative design is <br /> needed. If the wbeel paths stay within the roadbed <br /> without "hitting" any obstacles, then the geometry <br /> is adequate for that design vehicle. <br /> See Topic 404 for information on the design <br /> vehicles. A 15-meter and 18-meter radius template <br /> is given for each of the STAR and California Legal <br /> Design vehicles. The radius of the template is <br /> measured to the outside front wheel path through <br /> the curve. The 18-meter radius template is more <br /> conservative and is preferred. The 18-meter radius <br /> template requires less right of way on the inside of <br /> the curve, and it leaves a margin of error for the <br /> truck driver. The 18-meter radius template should <br /> be used for conditions where the vehicle may not <br /> be required to stop before entering the intersection. <br /> The 15-meter radius template can be used if the 18- <br /> meter radius template does not clear all obstacles. <br /> A 15-meter radius is the minimum radius that a <br /> STAA or California Design Vehicle can navigate. <br /> Figures 407A and B are templates for the <br /> STAR Design Vehicle turning on 15- <br /> meter and 18-meter radii, respectively. <br /> Figures 407C and D are templates for the <br /> California Design Vehicle turning on 15- <br /> meter and 18-meter radii, respectively. <br />