104.07 Arrow Panel (Ap)
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 100 PRELIMINARY SECTION 104.07 — ARROW PANEL (AP)
104.07.01 Description
Furnish and place APs for temporary use.
104.07.02 Materials
Arrow Panel QPL
104.07.03 Construction
At least 24 hours before use, furnish and test the arrow panel (AP). The AP shall be self-contained, vehicle-mounted or portable. Use a self-contained trailer unit unless otherwise specified. If a full matrix display board is used as an AP, it shall comply to this specification and it shall be able to display a left arrow, right arrow, double arrow, and a four-corner caution mode per the Arrow Panel tables. Elements. The AP unit shall conform to the Arrow Panel tables and be arranged with double- pointed arrow configuration capable of displaying a left arrow, right arrow, double arrow, and a four-corner caution mode. A sequential chevron, sequential arrow and single bar caution panel shall not be displayed. ARROW PANEL UNIT MdMUTCD TYPE Portable A, D Vehicle Mounted B Self-Contained Trailer C Arrow Board Type Minimum Size Minimum Legibility Distance Minimum Number of Elements A 48 in. x 24 in. 1/2 mile 12 B 60 in. x 30 in. 3/4 mile 13 C 96 in. x 48 in. 1 mile 15 D None* 1/2 mile 12 ∗Length of arrow equals 48 in., width of arrowhead equals 24 in.
104.07 Arrow Panel (Ap)
Type A, B, and C arrow boards shall have solid rectangular appearances. A Type D arrow board shall conform to the shape of the arrow. The color presented by the AP lights shall be yellow. Lights with the pre-flash option of white strobe or pulsed lighting shall not be displayed. APs shall have both manual and automatic dimmer devices capable of reducing the light intensity by 50 percent. Periodically clean the photocells in order to prevent malfunctioning of the brightness control. Dimmer devices are mandatory during night operation. The devices shall include a fail-safe system that ensures maximum brightness during daytime operations and a reduction in brightness of up to 50 percent during periods of darkness, regardless of which dimmer device is operational. The APs shall provide full illumination within at least a 24-degree cone perpendicular to the panel face. The flashing rate shall be not less than 25 or more than 40 flashes per minute as required in the MdMUTCD. Power Supply. The AP shall operate from a solar powered electrical system and consist of battery power and solar array panels and be capable of providing power supply to the AP for 21 consecutive days without auxiliary charge. Deployment. Place APs as specified. Maintain APs in good operating order.
a.The AP shall conform to the applicable requirements of the MdMUTCD and only be used to supplement other required traffic control devices. Use the "Arrow" mode when closing a through travel lane on a multilane roadway. Place only one AP in the "Arrow" mode for each stationary lane closure. “Arrow” mode shall not be used to indicate a lane shift. Moving work operations may utilize one or more APs for a single lane closure. Ensure that placement does not cause driver confusion near ramps, median crossovers, and side road intersections.
b.Place the AP facing approaching traffic in conformance with the minimum legibility distances specified in the Arrow Panel table. Ensure that the display is level.
c.For stationary lane closures, place the AP on the shoulder at the beginning of the taper (nearest to oncoming traffic). Where there are narrow or no existing shoulders adjacent to the closed lane behind the channelizing devices, place the AP as near to the beginning of the taper as possible.
d.For interior lane closure when the AP is displaying a flashing double arrow, center the AP in the closed lane and place it at the downstream end of the shifting taper. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
104.07 Arrow Panel (Ap)
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
e.For a lane closure on a two-lane, two-way roadway, or for a shoulder closure on roadways, use the “Caution” mode. In "Caution" mode, one light is displayed in each corner.
f.For moving operations, refer to Section 104.23.
104.07.04 Measurement and Payment
Arrow Panels will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each arrow panel will be paid for only once per unit day, regardless of how many times it may be relocated. When an arrow panel is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of an arrow panel, the unit day will be measured as 24 hour periods from start to finish. The payment will be full compensation for all material, labor, equipment, tools, and incidentals required to set up and operate at the site as required, and at any relocated site as specified and as directed.
104.08 Temporary Traffic Signs (Tts)
CATEGORY 100 PRELIMINARY SECTION 104.08 — TEMPORARY TRAFFIC SIGNS (TTS)
104.08.01 Description
Furnish, install, and maintain TTS on or along all transportation facilities.
104.08.02 Materials
Wood Sign Supports 921.05 and 921.06 Square Perforated Tubular Steel Sign Supports As Approved by the Office of Traffic and Safety Reflectorization 950.03 Signs 950.08 Portable Sign Supports, Composite Aluminum Signs, Plastic Signs, and Flexible Roll Up Signs QPL Temporary Traffic Sign Supports shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.08.03 Construction
Place signing in accordance with the MdMUTCD, the Administration’s Standard Highway Sign Book (SHSB), and the Contract Documents. All work area warning signs shall be 48 in. x 48 in. unless otherwise specified. The SHSB may be obtained from the Office of Traffic and Safety, Traffic Engineering Design Division. Designs of signs not included in the SHSB may be prepared by the Contractor in sketch form, to scale, and for approval. Sign designs may be obtained upon a seven-day request to the Office of Traffic and Safety. Make requests in written form directed to the Engineer. Mount signs that will be in place for more than three working days on two 4 in. x 4 in. wood posts or on two 2 in. x 2 in. square perforated tubular steel posts, unless otherwise specified. Mount the sign at a height of at least 7 ft or as specified. Do not place any additional bracing on wood posts unless the sign is behind the protective barrier. The tops of the wood posts shall not protrude more than 3 in. beyond the nearest edge of the sign. Place 4 in. x 4 in. wood posts at least 4 ft into the ground. Place 4 in. x 6 in. wood posts at least 5 ft into the ground. Signs on portable supports shall be mounted so that the bottom of the sign is at least 1 ft above the roadway pavement elevation. Portable sign supports shall be self-erecting, able to withstand a 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 165–167 of 1,113.