NCDOT PORTABLE PRESENCE LIGHT SPECIFICATION
NCDOT PORTABLE PRESENCE LIGHT SPECIFICATION
2. LANE CLOSURES EXCEEDING 2 MILES (MUST BE APPROVED BY THE ENGINEER) Single Work Operations: If the lane closure is longer than 2 miles within a single work operation, begin installing the work zone presence lighting at the halfway point of the lane closure length and continue placing the lights until the end of the lane closure. Same procedure for relocation shall be followed as described above. 3. MULTIPLE WORK OPERATIONS EXCEEDING 2 MILES (MUST BE APPROVED BY THE ENGINEER) If the lane closure is longer than 2 miles and 2 separate operations are working concurrently, treat as 2 separate locations. The Work Zone Presence Lights are installed at the halfway point in each operation. The lights in the 1st operation will end where the 2nd operation begins. The lights in the 2nd operation will terminate with the end of the lane closure. Same procedure for relocation shall be followed as described above. LIGHTING REQUIREMENTS Each light unit shall be capable of providing a minimum of 14,000 lumens illuminating a minimum area of approximately 3,000 square feet. The light shall be capable of being elevated to a height of 14 feet above the pavement. The lighting units shall be installed inside the lane closure as shown on the attached drawing and spaced according to the chart.
JANUARY 19, 2018 WORK ZONE PRESENCE LIGHTING SPECIFICATIONS
DESCRIPTION Furnish and install Work Zone Presence Lighting to supplement the Contractor’s construction/task (Portable Construction Lighting) and equipment lighting during nightly work activities on high speed (greater than 55 MPH) facilities and or facilities that have significant traffic volumes and impacts. The purpose of this additional lighting is to alert the motorist to the existence of an active work zone improve worker visibility and to assist in compliance of the work zone speed limit by providing lighting in advance and throughout the length of the lane closure. MATERIALS Anti-glare lighting systems are required. They are in addition to the Contractors’ portable construction lighting. These devices shall be installed in accordance with the attached drawing and Manufacturer’s recommendations. All Work Zone Presence Lighting shall be supplied with a power source to provide the light output as described in the chart below. All Work Zone Presence Lighting equipment shall be on the NCDOT Work Zone Traffic Control Approved Products List. CONSTRUCTION METHODS The purpose of Work Zone Presence lighting is to illuminate areas of the lane closure where construction/task lights are not located. Typical use is during lane closures for resurfacing and milling operations in locations where the pavement is being prepped for paving or milling as well as where these operations have passed through that involve remaining work items such as rolling, coring/inspecting, shoulder and striping activities.
SPACING CHART
LIGHT OUTPUT (LUMENS)
ILLUMINATED FIXTURE AREA- MINIMUM (SQUARE FEET)
MAXIMUM SPACING (FEET)
LIGHT UNITS (PER MILE)
14,000 to 35,000
4’
750’
7
35,001 to 60,000
5’
1,000’
5
Above 60,000
6’ or greater
1,320’
4
INSTALLATION LOCATIONS
Each light unit shall be installed and moved as necessary to allow for efficient paving operations to take place as well as to not interfere with the Contractor’s ability to light the work area. At no time shall Work Zone Presence Lighting be located in the same area as the Contractor’s construction/task lighting or conflict with his work operations. If the Contractor provides sufficient construction/task lighting to meet the luminance requirements of Section 1413-3 for the full length of the lane closure or if there’s sufficient existing overhead lighting, Work Zone Presence lighting may be eliminated as directed by the Engineer. Whenever possible, each light unit shall be placed on the 10’ paved shoulder according to the above spacing based on the amount of light output for each unit. Each light unit support base or mounting stand shall have the capability of being leveled.
1. STANDARD LANE CLOSURE LENGTHS OF 2 MILES OR LESS Position #1 : Initially, place the work zone presence lighting 1 mile downstream of the merge taper and continue until the end of the lane closure. Position #2 : Once paving operations progress to the point where the construction/task lighting has to be relocated to finish paving for the night, the Work Zone Presence Lighting shall be relocated to the beginning of the lane closure.
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