WORK ZONE PRESENCE LIGHTING:

(10/08/16)

Description

Furnish and install Work Zone “Presence” Lighting to supplement the Contractor’s task (Portable Construction Lighting) and equipment lighting during nightly work activitieson 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 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

Work Zone Presence Lighting is to provide lighting to areas of the lane closure where there is an absence of the Contractor’s task lighting. If the Contractor provides sufficient task lighting to meet the luminance requirements of Section 1413-3 of the 2012 NCDOT Standard Specifications for the full length of the lane closure, or if there is sufficient existing overhead lighting, Work Zone Presence Lighting may be eliminated as directed by the Engineer. Work Zone Presence Lighting shall not conflict with the Contractor’s lighting or work operations.

Each light unit shall be capable of providing a minimum of 50,000 lumens illuminating a minimum area of approximately 20,000 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 full length of the lane closure as shown on the attached drawing and spaced according to the chart.

SPACING CHART

Light Output
(Lumens) / Minimum Lighted Fixture Area (Square Feet) / Maximum Spacing
(Feet) / Light Units
(Per Mile)
50,000 to 65,000 / 5.5 / 750’ / 6
66,000 to 80,000 / 5.5 / 1,000’ / 5
81,000 to 100,000 / 36 / 1,250 / 4

Each light unit shall be installed along with the lane closure traffic control devices 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.

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 structure or mounting stand shall have the capability of being leveled.

Measurement and Payment

The measurement for the Work Zone Presence Lightingis made according tothe number of lighting units required per the spacing requirements and the attached drawing. Payment will be made for the maximum number of Work Zone Presence Lighting units satisfactorily installed and properly functioning at any one time during the life of the project. No measurement or separate payment will be made for power generators.

This includes all materials and labor to install, maintain and remove all theWork Zone Presence Lighting Units from the lane closure/s on a nightly basis.

Pay ItemPay Unit

Work Zone Presence LightingEach