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f <br /> 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 /> 4001 <br /> � — T,pe L On r.ea n 1 150'... I — — — —~for <br /> — <br /> • rlDu RREA <br /> Mwue WrMnN Siyn•Soo-to 750'apart. a nolo x) • '% i""/%%r <br /> :M •N •a o <br /> I f I 1 <br /> ROAD RM:Mi UN[ RIiN1�LANE END <br /> ■ORK CLOSED CLOSED ROAD 4 <br /> HEAD ANEAD ANEAD 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 L <br /> r Sign <br /> APPROACH TAPER NUMBER SPACING OF CONES a Cone or Portable Delineator <br /> SPEED LENGTH OF CONES ALONG TAPER <br /> (MPH) (L) * FOR TAPER* (Feet) t mm*- Direction of Traffic <br /> 25 125 6 25 Q Flashing Arrow Sign(Optional) <br /> 30 180 7 30 NOTES: IU <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 5060 <br /> Where: <br /> 50+ 1000 21 50 L = Minimum length of toper. <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 S. 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 <br /> available should be utilized to implement a 6. A C13 "END CONSTRUCTION" sign, as ap- <br /> closure even though such closure does not meet propriate,may be used in lieu of the C14.The sign <br /> the standards contained In this plan.As equip- is optional If the end of work zone is obvious or <br /> ment or personnel become available an Im- falls within a larger project limit. <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. S. 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" 10. The maximum spacing g <br /> minimum. {See Note 5) devices In a taper should be approximately tel ell equal <br /> P PP Y <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 />