Laserfiche WebLink
California Joint Utility Traffic Control Manual <br /> Table A-Recommended Advance Warning Sign Spacing <br /> Posted Speed Distance Between Signs** <br /> A B C <br /> Urban (low speed) 100 100 100 <br /> 25 mph or less <br /> Urban (high speed) <br /> more than 25 mph 250 250 250 <br /> to 40 mph <br /> Urban (high speed) 350 350 350 <br /> more than 40 mph <br /> Rural 500 500 500 <br /> 55 mph &above 1,000 1,500 2,640 <br /> ** Distances are shown in feet. The column headings A, B, and C are the <br /> dimensions shown on drawings No. 1-48. The A dimension is the distance from <br /> the 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 "first sign" is the sign in a three-sign series that is <br /> closest to the TTC zone. The third sign is one in a three sign series encountered by a <br /> driver/motorist approaching a TTC zone). <br /> Table B-Taper Length Criteria for Tem orary Traffic Control Zones <br /> Type of Taper Taper Length L <br /> Merging Taper at least L <br /> Shifting Taper at least 0.5L <br /> Shoulder Ta er at least 0.33L <br /> One-Lane, Two-Way Traffic Taper 50 feet minimum, 100 feet maximum <br /> L.Djownstream taper 50 feet min., 100 feet max. er lanW7A <br /> Table C- Formulas for Determining Taper Len the <br /> Speed Limit Taper Len th L Feet <br /> 40 mph or less L = WS /60 <br /> 45 mph or more L= WS <br /> Where: L= taper length in feet <br /> W= width of offset feet <br /> S = posted speed limit, or off peak (35th- percentile speed prior to work <br /> starting. Or the anticipated operating speed in mph <br /> 18 <br />