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5-48 TRAFFIC CONTROLS Traffic Manual <br /> 1.1990 <br /> Figure 5-9 <br /> TYPICAL LANE CLOSURE <br /> (TRAFFIC CONTROL SYSTEM FOR MULTILANE CONVENTIONAL HIGHWAYS) <br /> y 1&w L(S■lak 1) SO n �► <br /> ►dv.nce W.rmnq Sqn.500'l0 750 •Osn ( .. x) <br /> nm. low <br /> • • • • • • �` <br /> /////// <br /> 0 F <br /> l 1 l 1 <br /> ROAD RIGHT LANE I"LAM[ ROAEDNWORA <br /> MORK , CLOSED CLOSED <br /> AHEAD AHEAD AMEAD No Scale C14 <br /> (See note 6) <br /> C23 C20 (Rt.) C20 (Rt.) <br /> (See note <br /> 3 thru 5) <br /> Legend: <br /> TABLE 1 <br /> Sign <br /> APPROACH TAPER NUMBER SPACING OF CONES 0 Cone or Portable Delineator <br /> SPEED LENGTH OF CONES ALONG TAPER <br /> (MPH) (L) * FOR TAPER* (Feet) t w.41- Direction of Traffic <br /> 25 125 6 25 0 Flashing Arrow Sign (Optional) <br /> 30 180 7 30 NOTES: <br /> 35 245 8 35 <br /> Taper formula: <br /> 40 320 9 40 L = S x W for speeds of 45 or more. <br /> 45 540 13 45 L = WS x for speeds of 40 or less. <br /> 50 600 13 50Wh60 <br /> Where: <br /> 50+ 1000 21 50 L = Minimum length of taper. <br /> S = Numerical value of posted <br /> (*)Based on 12-foot wide lane.This column Is also appropriate for lane widths speed limit prior to work or <br /> less than 12 feet. 85 percentile speed. <br /> W = Width of offset. <br /> SPECIAL NOTE: Field conditions could require deviations from these plans and accompanying notes. <br /> NOTES: <br /> 1. This plan does not apply where there are 5. A C18 "ROAD CONSTRUCTION AHEAD" sign <br /> emergency conditions. Under emergency condi- may be used in lieu of the C23. (See Note 3) <br /> tions, equipment and personnel which are 6. A C13 "END CONSTRUCTION" sign, as ap- <br /> available should be utilized to Implement a propriate,may be used in lieu of the C14.The sign <br /> closure even though such closure does not meet <br /> the standards contained In this plan. As equip- on <br /> is optional If the end of work zone Is obvious or <br /> ment or personnel become available an im- <br /> falls within a larger project zoo <br /> mediate effort should then be made to implement 7. Warning (W) series signs used In work zones <br /> the standards shown on this plan. shall be black on orange. Existing yellow warn- <br /> 2. Where approach speeds are low, signs may be Ing signs already In place within these areas may <br /> placed at 300 feet spacings, and even closer In remain in use. <br /> urban areas. 8. Pavement markings for closures shall conform <br /> 3. All advance warning signs shall be 48" x 48" to Section 5-05 of this manual. <br /> minimum on highways with approach speeds of 9. All cones shall be Internally Illuminated or fitted <br /> 45 mph or more. When speeds are less than 45 with reflective white sleeves for night closures <br /> mph the C23 sign shall be 30" x 30" minimum; (See Section 5-03.3). <br /> other advance warning signs shall be 36" x 36" <br /> minimum. (See Note 5) 10. The maximum spacing between channelizing <br /> devices in a taper should be approximately equal <br /> 4. All warning signs for night closures shall be In feet to the speed limit. (See Table 1) <br /> either Illuminated or reflectorized. <br />