Notes for Figure 6H-21—Typical Application 2Lane Closure on the Near Side of an Intersection

Standard:

 

    1. The merging taper shall direct vehicular traffic into either the right-hand or left-hand lane, but not both.

 

Guidance:

 

  1.   In this typical application, a left taper should be used so that right-turn movements will not impede through motor vehicle traffic. However, the reverse should be true for left-turn movements.
  2.   If the work space extends across a crosswalk, the crosswalk should be closed using the information andevices shown in Figure 6H-29.

 

Option:

 

  1.   Flashing warning lights and/or flags may be used to call attention to the advance warning signs.
  2.   A shadow vehicle with a truck-mounted attenuator may be used.
  3.   A work vehicle with high-intensity rotating, flashing, oscillating, or strobe lights may be used with the high-level warning device arroboard.
  4.   Vehicle hazard warning signals may be used to supplement high-intensity rotating, flashing, oscillating, or strobe lights.

 

Standard:

 

    8. Vehicle hazard warning signals shall not be used instead of the vehicle’s high-intensity rotatingflashing, oscillating, or strobe lights.

      

 

Notes for Figure 6H-22, 6H-22A(CA) and 6H-22B(CA) —Typical Application 2Right-Hand Lane Closure on the Far Side of an Intersection

Guidance:

 

  1. If the work space extends across a crosswalk, the crosswalk should be closed using the information andevices shown in Figure 6H-29.

Option:

 

  1. The normal procedure is to close on the near side of the intersection any lane that is not carried through the intersection. However, when this results in the closure of a right-hand lane having significant right turning movements, then the right-hand lane may be restricted to right turns only, as shown. This procedure increases the through capacity by eliminating right turns from the open through lane.
  2. For intersection approaches reduced to a single lane, left-turning movements may be prohibited to maintain capacity for through vehicular traffic.
  3. Flashing warning lights and/or flags may be used to call attention to the advance warning signs.
  4. Where the turning radius is large, it may be possible to create a right-turn island using channelizing devices or pavement markings. 
  5. See Figure 3B-­14(CA) Page 3 of 3 for lane reduction markings. See Section 2C.40 for merge signs.

Support:

  1. Figure 6H-­22 is appropriate for short­term and intermediate­term duration where it is not appropriate to install temporary markings.
  2. Figure 6H­-22A(CA) is appropriate for long­term duration.
  3. Figure 6H­-22B(CA) is appropriate to avoid through movements from the right lane by first closing the right lane and then reopening it as a turn bay. 

Notes for Figure 6H-24 and 6H-24A(CA—Typical Application 2Half Road Closure on the Far Side of an Intersection

Guidance:

 

  1.    If the work space extends across a crosswalk, the crosswalk should be closed using the information andevices shown in Figure 6H-29.
  2.   When turn prohibitions are implemented, two turn prohibition signs should be used, one on the near sidand, space permitting, one on the far side of the intersection.

 

Option:

 

  1.   A buffer space may be used between opposing directions of vehicular traffic as shown in this application.
  2.   The normal procedure is to close on the near side of the intersection any lane that is not carried through the intersection. However, if there is a significant right-turning movement, then the right-hand lane may be restricted to right turns only, as shown.
  3.   Where the turning radius is large, a right-turn island using channelizing devices or pavement markings may be used.
  4.   There may be insufficient space to place the back-to-back Keep Right sign and No Left Turn symbol signs at the end of the row of channelizing devices separating opposing vehicular traffic flows. In this situation, the No Left Turn symbol sign may be placed on the right and the Keep Right sign may be omitted.
  5.   For intersection approaches reduced to a single lane, left-turning movements may be prohibited to maintain capacity for through vehicular traffic.
  6.   Flashing warning lights and/or flags may be used to call attention to advance warning signs.
  7.   Temporary pavement markings may be used to delineate the travel path through the intersection. 

Support:

 

  1.    Keeping the right-hand lane open increases the through capacity by eliminating right turns from the open through lane.
  2.    A temporary turn island reinforces the nature of the temporary exclusive right-turn lane and enables second RIGHT LANE MUST TURN RIGHT sign to be placed in the island.
  3.    Figure 6H­-24 is appropriate for situations where the approach is stop­controlled (Stop sign and/or red flashing beacons) due to the abrupt transition through the intersection.
  4.    Figure 6H­-24A(CA) is appropriate for situations where the approach is uncontrolled or controlled by traffic signals. 
 

Notes for Figure 6H-23—Typical Application 2Left-Hand Lane Closure on the Far Side of an Intersection

Guidance:

 

     1. If the work space extends across a crosswalk, the crosswalk should be closed using the information andevices shown in Figure 6H-29.

 

Option:

 

  1.   Flashing warning lights and/or flags may be used to call attention to the advance warning signs.
  2.   The normal procedure is to close on the near side of the intersection any lane that is not carried through the intersection. However, when this results in the closure of a left lane having significant left-turning movements, then the left lane may be reopened as a turn bay for left turns only, as shown.

 

Support:

 

     4. By first closing off the left lane and then reopening it as a turn bay, the left-turn bay allows storage of    turning vehicles so that the movement of through traffic is not impeded. A left-turn bay that is long enough to accommodate all turning vehicles during a traffic signal cycle will provide the maximum benefit for through traffic. Also, an island is created with channelizing devices that allows the LEFT LANE MUST TURN LEFT sign to be repeated on the left adjacent to the lane that it controls.

 

Notes for Figure 6H-25 and 6H25A(CA—Typical Application 2Multiple Lane Closures at an Intersection

Guidance:

 

  1. If the work space extends across a crosswalk, the crosswalk should be closed using the information andevices shown in Figure 6H-29.
  2. If the left through lane is closed on the near-side approach, the LEFT LANE MUST TURN LEFT sign should be placed in the median to discourage through vehicular traffic from entering the left-turn bay.

Support:

 

  1. The normal procedure is to close on the near side of the intersection any lane that is not carried through the intersection (seFigur6H-25A(CA))

Option:

 

  1. If the left-turning movement that normally uses the closed turn bay is small and/or the gaps in opposinvehicular traffic are frequent, left turns may be permitted on that approach.
  2. Flashing warning lights and/or flags may be used to call attention to the advance warning signs.