Notes for Figure 6H-10(CA) and 6H-10A(CA—Typical Application 1Lane Closure on a Two-Lane Road Using Flaggers

 

Option:

 

  1. For low-volume situations with short work zones on straight roadways where the flagger is visible to road users approaching from both directions, a single flagger, positioned to be visible to road users approaching from both directions, may be used (see Chapter 6E).
  2. The ROAD WORK AHEAD and the END ROAD WORK signs may be omitted for short-duratiooperations.
  3. Flashing warning lights and/or flags may be used to call attention to the advance warning signsA BE PREPARED TO STOP sign may be added to the sign series.

Guidance

 

  1. The buffer space should be extended so that the two-way traffic taper is placed before a  horizontal (or crest vertical) curve to provide adequate sight distance for the flagger  and a queue of stopped vehicles.

Standard:

 

  1. At night, flagger stations shall be illuminated, except in emergencies.

Guidance:

 

  1. When used, the BE PREPARED TO STOP sign should be located between after the Flagger sign and the ONE LANE ROAD sign.
  2. When a grade crossing exists within or upstream of the transition area and it is anticipated that queues resulting from the lane closure might extend through the grade crossing, the TTC zone should be extended so that the transition area precedes the grade crossing.
  3. When a grade crossing equipped with active warning devices exists within the activity area, provisionshould be made for keeping flaggers informed as to the activation status of these warning devices.
  4. When a grade crossing exists within the activity area, drivers operating on the left-hand side of the normal center line should be provided with comparable warning devices as for drivers operating on the right-hand side of the normal center line.
  5. Early coordination with the railroad company or light rail transit agency should occur before work starts.

Option:

 

  1. A flagger or a uniformed law enforcement officer may be used at the grade crossing to minimize the probability that vehicles are stopped within 15 feet of the grade crossing, measured from both sides of the outside rails.

Support:

 

  1. For State highways, see Department of Transportation's Standard Plan T13. See Section 1A.11 for information regarding this publication.
  2. If portable transverse rumble strips are used for flagging operations, refer to Section 6F.87.

 

Notes for Figure 6H­105(CA)—Typical Application 105(CA)    Lane Shift on Road with Low Traffic Volumes 

Guidance:

  1. The lanes on either side of the center work space should have a minimum width of 10 feet as measured from the near edge of the channelizing devices to the edge of pavement or the outside edge of paved shoulder.
  2.  All advance warning signs should be placed so that the path of travel for bicycles is not blocked while maintaining visibility for road users.

Standard:

  1. Workers in the roadway shall wear high­visibility safety apparel as described in Section 6D.03.

Option:

  1. Flashing warning lights and/or flags may be used to call attention to the advance warning signs.
  2. If the closure continues overnight, warning lights may be used on the channelizing devices.
  3. A lane width of 9 feet may be used for short­term stationary work on low ­volume, low­ speed roadways when motor vehicle traffic does not include longer and wider heavy commercial vehicles.
  4. A work vehicle displaying high­intensity rotating, flashing, oscillating, or strobe lights may be used instead of the channelizing devices forming the tapers or the high­level warning devices.
  5. Vehicle hazard warning signals may be used to supplement high­intensity rotating, flashing, oscillating, or strobe lights.

Standard:

  1. Vehicle hazard warning signals shall not be used instead of the vehicle’s high ­intensity rotating, flashing, oscillating, or strobe lights.
  2. Notes 6 and 7 shall not be applicable for State highways. Note #1 shall be used instead for State highways 

Notes for Figure 6H-12 —Typical Application 1Lane Closure on a Two-Lane Road Using Traffic Control Signals

 

 Standard:

 

  1.   Temporary traffic control signals shall be installed and operated in accordance with the provisions of Part 4. Temporary traffic control signals shall meet the physical display and operational requirements of conventional traffic control signals.
  2.   Temporary traffic control signal timing shall be established by authorized officials. Durations of red clearance intervals shall be adequate to clear the one-lane section of conflicting vehicles.
  3.   When the temporary traffic control signal is changed to the flashing mode, either manually oautomatically, red signal indications shall be flashed to both approaches.
  4.   Stop lines shall be installed with temporary traffic control signals for intermediate and long-term closures. Existing conflicting pavement markings and raised pavement marker reflectors between the activity area and the stop line shall be removed. After the temporary traffic control signal is removed, the stop lines and other temporary pavement markings shall be removed and the permanent pavement markings restored.
  5.   Safeguards shall be incorporated to avoid the possibility of conflicting signal indications at each end of the TTC zone.

 

 Guidance:

 

  1.   Where no-passing lines are not already in place, they should be added.
  2.   Adjustments in the location of the advance warning signs should be made as needed to accommodate the horizontal or vertical alignment of the roadway, recognizing that the distances shown for sign spacings are minimums. Adjustments in the height of the signal heads should be made as needed to conform to the vertical alignment.

 

 Option:

 

  8. Flashing warning lights shown on the ROAD WORK AHEAD and the ONE LANE ROAD AHEAD signs may be used.

  9 . Removable markings may be used.

 

      Support:

 

  1.   Temporary traffic control signals are preferable to flaggers for long-term projects and other activities that would require flagging at night.
  2.   The maximum length of activity area for one-way operation under temporary traffic control signal control is determined by the capacity required to handle the peak demand.

Notes for Figure 6H-11—Typical Application 1Lane Closure on a Two-Lane Road with Low Traffic Volumes

 

Option:

 

  1. This TTC zone application may be used as an alternate to the TTC application shown in Figure 6H-10 6H-10(CA(using flaggers) when the following conditions exist:

a. Vehicular traffic volume is such that sufficient gaps exist for vehicular traffic that must yield.

b. Road users from both directions are able to see approaching vehicular traffic through and beyond the worksite and have sufficient visibility of approaching vehicles.

  1. The Type B flashing warning lights may be placed on the ROAD WORK AHEAD and the ONE LANE ROAD AHEAD signs whenever a night lane closure is necessary.

Standard:

 

  1. The approach to the side that is not closed shall be visible (for a distance equal to the safe passing sight distance for that approach) to the driver who must yield or stop.

Support:

 

         See Section 3B.02 and 6C.15.

 

Notes for Figure 6H-13 —Typical Application 1Temporary Road Closure

Support:

 

1. Conditions represented are a planned closure not exceeding 20 minutes during the daytime.

 

Standard:

 

2. A flagger or uniformed law enforcement officer shall be used for this application. The flagger, if used for this application, shall follow the procedures provided in Sections 6E.07 and 6E.08.

 

Guidance:

 

3. The uniformed law enforcement officer, if used for this application, should follow the procedures provided in Sections 6E.07 and 6E.08.

 

Option:

 

4. A BE PREPARED TO STOP sign may be added to the sign series.

 

Guidance:

 

5. When used, the BE PREPARED TO STOP sign should be located before aftethe Flagger symbol sign.