Option: 07 Where the number of through lanes on an approach is two or less, the Intersection Lane Control signs R, R, or R may be overhead or post-mounted.
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When the mandatory movement applies to lanes exclusively designated for HOV traffic, the RcP supplemental plaque shall be used. If Mandatory Lane Movement Control R symbol signs with supplemental RbP or RfP plaques are used, they should be mounted adjacent to and along only the full width portion of the turn lane.
Interview under caution
The R sign should not be installed adjacent to a through lane in advance of a turn bay taper or adjacent to a turn bay taper. Option: 08 The Straight Through Only Ra sign may be used to require a road user in a particular lane to proceed straight through an intersection. Standard: 01 If used, the Optional Movement Lane Control R sign see Figure 2B-4 shall be used for two or more movements from a specific lane or to emphasize permitted movements.
Option: 07 The word message OK may be used within the border in combination with the arrow symbols of the R sign. The diamond symbol may be used instead of the word message HOV. The minimum allowable vehicle occupancy requirement may vary based on the level established for a particular facility. Guidance: 03 If used, an Advance Intersection Lane Control sign should be placed at an adequate distance in advance of the intersection so that road users can select the appropriate lane see Figure 2A If used, the Advance Intersection Lane Control sign should be installed either in advance of the tapers or at the beginning of the turn lane.
Option: 04 An Advance Intersection Lane Control sign may be repeated closer to the intersection for additional emphasis. Standard: 05 Where three or more approach lanes are available to traffic, Advance Intersection Lane Control R series signs, if used, shall be post-mounted in advance of the intersection and shall not be mounted overhead see Section 2B. Support: 02 Section 2C. Guidance: 01 Two-Way Left Turn Only Ra or Rb signs see Figure 2B-6 should be used in conjunction with the required pavement markings where a non-reversible lane is reserved for the exclusive use of left-turning vehicles in either direction and is not used for passing, overtaking, or through travel.
Option: 02 The post-mounted Rb sign may be used as an alternate to or a supplement to the overhead Ra sign. Support: 03 Signing is especially helpful to drivers in areas where the two-way left turn only maneuver is new, in areas subject to environmental conditions that frequently obscure the pavement markings, and on peripheral streets with two-way left turn only lanes leading to an extensive system of routes with two-way left turn only lanes.
Option: 01 A reversible lane may be used for through traffic with left turns either permitted or prohibited in alternating directions during different periods of the day, and the lane may be used for exclusive left turns in one or both directions during other periods of the day as well. Reversible Lane Control Re through Ri signs see Figure 2B-6 may be either static type or changeable message type. These signs may be either post-mounted or overhead.
Standard: 02 post-mounted Reversible Lane Control signs shall be used only as a supplement to overhead signs or signals.
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For both word messages and symbols, this legend shall be at the top of the sign. Option: 04 Reversing traffic flow may be controlled with pavement markings and Reversible Lane Control signs without the use of lane control signals , when all of the following conditions are met:.
Standard: 05 Reversible Lane Control signs shall contain the legend or symbols designating the allowable uses of the lane and the time periods such uses are allowed. Where symbols and legends are used, their meanings shall be as shown in Table 2B All times of the day and days of the week shall be accounted for on the sign to eliminate confusion to the road user. Standard: 10 A Reversible Lane Control sign shall be mounted over the center of the lane that is being reversed and shall be perpendicular to the roadway alignment.
The placement of the signs shall be such that the driver will have a definite indication of the lanes specifically reserved for use at any given time. Special consideration shall be given to major generators introducing traffic between the normal sign placement. The Rg or Rh signs shall be used for this purpose.
Option: 13 More than one sign may be used at the termination of the reversible lane to emphasize the importance of the message Ri.
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Standard: 14 Flashing beacons, if used to accentuate the overhead Reversible Lane Control signs, shall comply with the applicable requirements for flashing beacons in Chapter 4L. The Turn Prohibition signs shall be designed and installed in accordance with Section 2B. The bottom of the overhead Reversible Lane Control signs should not be more than 19 feet above the pavement grade. Longer distances between signs are appropriate for streets with speeds over 35 mph, but the separation should not exceed 1, feet.
Support: 01 A jughandle turn is a left-turn or U-turn that because of special geometry is made by initially making a right turn. This type of turn can increase the operational efficiency of a roadway by eliminating the need for exclusive left-turn lanes and can increase the operational efficiency of a traffic control signal by eliminating the need for protected left-turn phases. A jughandle turn can also provide an opportunity for trucks and commercial vehicles to make a U-turn where the median and roadway are not of sufficient width to accommodate a traditional U-turn by these vehicles.
Figure 2B-9 shows examples of regulatory and destination guide signing for various types of jughandle turns. Figure 2B-8 Jughandle Regulatory Signs. Option: 04 Where a median of sufficient width is available, supplemental regulatory or guide signs may also be placed on the left-hand side of the roadway. Standard: 05 An R series sign with an upward diagonal arrow pointing to the right if the jughandle entrance is designed as an exit ramp see Drawings A and B of Figure 2B-9 or an R series sign with a horizontal arrow pointing to the right if the jughandle entrance is designed as an intersection shall be installed on the right-hand side of the roadway at the entrance to the jughandle.
Support: 07 The R, R, and R series of signs are designed to be mounted below conventional guide signs. The Do Not Pass sign may be used at the beginning of, and at intervals within, a zone through which sight distance is restricted or where other conditions make overtaking and passing inappropriate.
Support: 03 Standards for determining the location and extent of no-passing zone pavement markings are set forth in Section 3B. This sign should not be used on the approach to an interchange or through an interchange area. Both signs may be used on multi-lane roadways to improve capacity and reduce lane changing.
Guidance: 04 If an extra lane has been provided for trucks and other slow-moving traffic, a Lane Ends sign see Section 2C. Appropriate pavement markings should be installed at both the upstream and downstream ends of the extra lane see Section 3B. Support: 05 Section 2D. Option: 01 The Keep Right R sign see Figure 2B may be used at locations where it is necessary for traffic to pass only to the right-hand side of a roadway feature or obstruction. The Keep Left R sign see Figure 2B may be used at locations where it is necessary for traffic to pass only to the left-hand side of a roadway feature or obstruction.
Guidance: 02 At locations where it is not readily apparent that traffic is required to keep to the right, a Keep Right sign should be used. The sign should be mounted on the face of or just in front of a pier or other obstruction separating opposite directions of traffic in the center of the highway such that traffic will have to pass to the right-hand side of the sign. Standard: 04 The Keep Right sign shall not be installed on the right-hand side of the roadway in a position where traffic must pass to the left-hand side of the sign.
Option: 05 The Keep Right sign may be omitted at intermediate ends of divisional islands and medians. Standard: 09 A narrow Keep Right Rc sign shall not be installed on a median island that has a width of 4 feet or more at the point where the sign is to be located. Support: 03 The specific number of vehicles displayed on the R sign provides law enforcement personnel with the information they need to enforce this regulation. Support: 06 Section 2D. Figure 2B Selective Exclusion Signs. The sign should be mounted on the right-hand side of the roadway, facing traffic that might enter the roadway or ramp in the wrong direction.
Support: 03 Section 2B. Support: 01 Selective Exclusion signs see Figure 2B give notice to road users that State or local statutes or ordinances exclude designated types of traffic from using particular roadways or facilities. Standard: 02 If used, Selective Exclusion signs shall clearly indicate the type of traffic that is excluded. Support: 03 Typical exclusion messages include:. If Keep Right signs are installed, they shall be placed as close as practical to the approach ends of the medians and shall be visible to traffic on the divided highway and each crossroad approach.
If ONE WAY signs are installed, they shall be placed on the near right and far left corners of the intersection and shall be visible to each crossroad approach. Option: 05 At an intersection with a divided highway that has a median width at the intersection itself of less than 30 feet, ONE WAY signs may also be placed on the far right corner of the intersection as shown in Figures 2B and 2B Standard: 07 If used at unsignalized intersections with one-way streets, ONE WAY signs shall be placed on the near right and the far left corners of the intersection facing traffic entering or crossing the one-way street see Figure 2B Guidance: 12 Where used on the central island of a roundabout, the mounting height of a ONE WAY sign should be at least 4 feet, measured vertically from the bottom of the sign to the elevation of the near edge of the traveled way.
Scope of this note
Support: 13 Using ONE WAY signs on the central island of a roundabout might result in some drivers incorrectly concluding that the cross street is a one-way street. Using Roundabout Directional Arrow signs might reduce this confusion. Standard: 01 At interchange exit ramp terminals where the ramp intersects a crossroad in such a manner that wrong-way entry could inadvertently be made, the following signs shall be used see Figure 2B :. Guidance: 02 In addition, the following pavement markings should be used see Figure 2B :. Option: 03 The following traffic control devices may be used to supplement the signs and pavement markings described in Paragraphs 1 and 2 :.
Guidance: 04 On interchange entrance ramps where the ramp merges with the through roadway and the design of the interchange does not clearly make evident the direction of traffic on the separate roadways or ramps, a ONE WAY sign visible to traffic on the entrance ramp and through roadway should be placed on each side of the through roadway near the entrance ramp merging point as illustrated in Figure 2B Option: 05 At locations where engineering judgment determines that a special need exists, other standard warning or prohibitive methods and devices may be used as a deterrent to the wrong-way movement.
Support: 07 Section 2B.
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