Notes for Figure 6H-30—Typical Application 3Interior Lane Closure on a Multi-Lane Street

Guidance:

 

  1. This information applies to low-speed, low-volume urban streets. Where speed or volume is higheradditional signing such as LEFT LANE CLOSED XX FT should be used between the signs shown.

Option:

 

  1. The closure of the adjacent interior lane in the opposing direction may not be necessary, depending upon the activity being performed and the work space needed for the operation.
  2. Shadow vehicles with a truck-mounted attenuator may be used.
  3. The RIGHT (LEFT) LANE(S) CLOSED (W20-5 or C20(CA)) sign may be used instead of the Lane Reduction (W4-2) sign.

Guidance:

 

  1. All advance warning signs should be placed so that the path of travel for bicycles in not blocked, while maintaining visibility for road users
  2. When existing accommodations for bicycle travel are disrupted or closed in a longterm duration project (See Section 6G.02) and the roadway width is inadequate forallowing bicyclists and motoe vehicles to travel side by side, the Bicycle Crossing (W11-1) sign and the SHARE THE ROAD (W16-1P) plaque should be used to advisemotorists of the presence of bicyclists in the travel way lanes.
  3. If bicyclists are able to use the shoulder throughout the TTC zone, the Bicycle Crossing (W11-1) sign and the SHARE THE ROAD (W16-1P) plaque should be omitted.

Notes for Figure 6H-31 —Typical Application 3Lane Closure on a Street with Uneven Directional Volumes

Standard:

 

     1. The illustrated information shall be used only when the vehicular traffic volume indicates that twlanes of vehicular traffic shall be maintained in the direction of travel for which one lane is closed.

 

Option:

 

     2. The procedure may be used during a peak period of vehicular traffic and then changed to provide two lanes in the other direction for the other peak.

 

Guidance:

 

  1.   For high speeds, a LEFT LANE CLOSED XX FT sign should be added for vehicular traffic approaching the lane closure, as shown in Figure 6H-32 6H-32(CA).
  2.   Conflicting pavement markings should be removed for long-term projects. For short-term and intermediate-term projects where this is not practical, the channelizing devices in the area where the pavement markings conflict should be placed at a maximum spacing of 1/2 S feet where S is the speed in mph. Temporary markings should be installed where needed.The spacing of channelizing devices should not exceed the maximum distances shown in Table 6F-101(CA). Refer to Section 6F.63 for spacing of channelizing devices 
  3.   If the lane shift has curves with recommended speeds of 30 mph or less, Reverse Turn signs should be used.
  4.   Where the shifted section is long, a Reverse Curve sign should be used to show the initial shift and a second sign should be used to show the return to the normal alignment.
  5.    If the tangent distance along the temporary diversion is less than 600 feet, the Double Reverse Curve sign should be used at the location of the first Two Lane Reverse Curve sign. The second Two Lane Reverse Curve sign should be omitted.Use the Reverse Curve (W1-4) signs for both locations instead of the Double Reverse Curve or Two Lane Reverse Curve signs. 

 

Standard:

 

      8. The number of lanes illustrated on the Reverse Curve  or Double Reverse Curve signs shall be the same as the number of through lanes available to road users, and the direction of the reverse curves shall be appropriately illustrated. Curve warning signs with multiple arrows shall not be used in California. Only W1-3, W1-4, and W24-1 signs shall be used.

 

Option:

 

  1. A longitudinal buffer space may be used in the activity area to separate opposing vehicular traffic.
  2. Where two or more lanes are being shifted, a W1-4 (or W1-3) sign with an ALL LANES (W24-1cP) plaque (see Figure 6F-4) may be used instead of a sign that illustrates the number of lanes.
  3. Where more than three lanes are being shifted, the Reverse Curve (or Turn) sign may be rectangular.
  4. A work vehicle or a shadow vehicle may be equipped with a truck-mounted attenuator.
  5. When recommended speeds are the same for each curve, one Double Reverse Curve (W24-1) sign may be used, instead of two Reverse Curve (W1-4) signs, in advance of the first curve.

 

Notes for Figure 6H-33 —Typical Application 3Stationary Lane Closure on a Divided Highway

 

Standard:

 

  1. This information also shall be used when work is being performed in the lane adjacent to the median on a divided highway. In this case, the LEFT LANE CLOSED signs and the corresponding Lane Ends signs shall be substituted.
  2. When a side road intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

 

  1. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.

Option:

 

  1. A truck-mounted attenuator may be used on the work vehicle and/or shadow vehicle. 

Support:

 

  1. Where conditions permit, restricting all vehicles, equipment, workers, and their activities to one side of the roadway might be advantageous.

Standard:

 

  1. An arrow board shall be used when a freeway lane is closed. When more than one freeway lane iclosed, a separate arrow board shall be used for each closed lane.

Support:

 

  1. See Section 6F.106(CA) for use of the Slow For The Cone Zone (SC19(CA) and SC20(CA)) Signs. 

Notes for Figure 6H-32 6H32(CA—Typical Application 3Half Road Closure on a Multi-Lane, High-Speed Highway

Standard:

  1. Pavement markings no longer applicable shall be removed or obliterated as soon as practical. Except for intermediate-term and short-term situations, temporary markings shall be provided to clearly delineate the temporary travel path. For short-term and intermediate-term situations where it is not feasible to remove and restore pavement markings, channelization shall be made dominant by using a very close device spacing.

Guidance:

 

  1. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.
  2. Where channelizing devices are used instead of pavement markings, the maximum spacing should be 1/2 S feet where S is the speed in mph. The spacing of channelizing devices should not exceed the maximum distances shown in Table 6F-101(CA). Refer to Section 6F.63 for spacing of channelizing devices.
  3. If the tangent distance along the temporary diversion is less than 600 feet, a Double Reverse Curve sign should be used instead of the first Reverse Curve sign, and the second Reverse Curve sign should be omitted.

Opion:

 

  1. Warning lights may be used to supplement channelizing devices at night.
  2. A truck-mounted attenuator may be used on the work vehicle and/or the shadow vehicle.

Support:

 

  1. See Section 6F.106(CA) for use of the Slow For The Cone Zone (SC19(CA) and SC20(CA)) Signs

Guidance:

 

  1. All advance warning signs should be placed so that the path of travel  for bicycles is not blocked, while maintaining visibility for road users.
  2. If bicyclists are able to use the shoulder throughout the TTC zone, the Bicycle Crossing (W11­1) sign should be used and the SHARE THE ROAD (W16­-1P) plaque should be omitted.
  3. The speeds used for the shoulder taper calculations should be of bicyclists in the project vicinity or if a special event such as a bike race, the expected speed of bicyclists approaching the TTC zone. 
  4. If bicyclists are sharing the traveled way lanes with motorists, speed reduction countermeasures should be used to reduce traffic speeds in the TTC zone. Refer to Sections 6C.01 and 6D.03.
  5. When existing accommodations for bicycle travel are disrupted or closed in a long­term duration project (see Section 6G.02) and the roadway width is inadequate for allowing bicyclists and motor vehicles to travel side by side, the Bicycle Crossing (W11­-1) sign and the SHARE THE ROAD (W16-­1P) plaque should be used to advise motorists of the presence of bicyclists in the travel way lanes. 

Notes for Figure 6H-34—Typical Application 3Lane Closure with a Temporary Traffic Barrier

Standard:

 

  1. This information also shall be used when work is being performed in the lane adjacent to the median on a divided highway. In this case, the LEFT LANE CLOSED signs and the corresponding Lane Ends signs shall be substituted.

Guidance:

 

  1. For long-term lane closures on facilities with permanent edge lines, a temporary edge line should be installed from the upstream end of the merging taper to the downstream end of the downstream taper, and conflicting pavement markings should be removed.
  2. The use of a barrier should be based on engineering judgment.

Standard:

 

  1. Temporary traffic barriers, if used, shall comply with the provisions of Section 6F.85.
  2. The barrier shall not be placed along the merging taper. The lane shall first be closed usinchannelizing devices and pavement markings.

Option:

 

  1. Type C Steady-Burn warning lights may be placed on channelizing devices and the barrier parallel to thedge of pavement for nighttime lane closures.
  2. The barrier shown in this typical application is an example of one method that may be used to close a lane for a long-term project. If the work activity permits, a movable barrier may be used and relocated to the shoulder during non-work periods or peak-period vehicular traffic conditions, as appropriate.

Standard:

 

  1. If a movable barrier is used, the temporary white edge line shown in the typical application shall not be used. During the period when the right-hand lane is opened, the sign legends and the channelization shall be changed to indicate that only the shoulder is closed, as illustrated in Figure 6H-5 6H-5(CA). The arrow board, if used, shall be placed at the downstream end of the shoulder taper and shall display the caution mode.

Guidance:

 

  1. If a movable barrier is used, the shift should be performed in the following manner. When closing the lane, the lane should be initially closed with channelizing devices placed along a merging taper using the same information employed for a stationary lane closure. The lane closure should then be extended with the movable-barrier transfer vehicle moving with vehicular traffic. When opening the lane, the movable barrier transfer vehicle should travel against vehicular traffic from the termination area to the transition area. The merging taper should then be removed using the same information employed for a stationary lane closure