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Work Area Protection and Traffic Control Manual <br /> Temporary Traffic Control (TTC) General/Reference Information <br /> TTC Sian Recommendations <br /> 45 mph (70 km/h) or greater = 48 inch (122 cm) sign minimum <br /> 40 mph (65 km/h) or less = 36 inch (92 cm) sign minimum <br /> Approved warning signs shall be installed and properly maintained whenever hazards <br /> exist due to moving or stationary vehicles, open excavations, construction or <br /> maintenance operations or similar work. Warning signs shall be placed so as to provide <br /> adequate notice to motorists, bicyclists or pedestrians that they are approaching an <br /> excavation, obstruction or hazard. Warning signs shall be removed as soon as the <br /> excavation, obstruction or hazard is removed or cleared. <br /> TABLE A <br /> Suggested Advanced Warning Sign Spacing <br /> Road Type Distance Between Si ns <br /> AB <br /> Urban lows eed * 30 100 C30 100 <br /> Urban hi h s eed " 100350 30 (100) <br /> Rural 100 350 100 350 <br /> 150 500 150 /5^-j I 150 500 <br /> Expressway/Freeway 300 1,000 450 14,500 <br /> 800 2,640 <br /> Speed category to be determined by highway agency <br /> Distances are shown in meters (feet). The A dimension is the distance from the <br /> transition or point of restriction to the first sign. The B dimension is the distance <br /> between the first and second signs. The C dimension is the distance between the <br /> second and third signs. (The third sign is one in a three sign series encountered by a <br /> driver/motorist approaching a TTC zone.) <br /> Taper Length Criteria for Temporary Traffic Control Zones <br /> T e of Ta er Taper Length L <br /> r <br /> er in TaDer iftin Ta er at least L <br /> oulder Taper at least 0.51- <br /> - <br /> e-Lane, Two-Wa Traffic Ta er -- -- of least 0.33E30 meters 100 feet maximum <br /> wnstream taper 30 meters 100 feet per lane <br /> �jj- <br /> Formulas for Determining Taper Lengths <br /> Speed Lirnit <br /> Taper Length (L) Meters <br /> 60 km/h or less L = WS /155 — <br /> - -� <br /> 70 km/h or more - <br /> 40 i mph or less --- <br /> aper Leenn�th (L) Feet--- ------- L= WS /60 -------- <br /> 45 mph or_r more <br /> ------—-- _ L= WS <br /> 9 <br />