11.5.1 Roadway / Street Lighting

Street lighting shall be used to reinforce the street hierarchy for the Cantonment Area and Butts AAF.  Street hierarchy shall be expressed through varying illumination levels and by type, height, and spacing of light poles and fixtures.  

11.5.1.1 Primary Street, Divided

lighting for primary street, divided

For divided streets, the street lighting poles shall be centered in the central median and shall have the following characteristics:  

• Lamp type - high-pressure sodium.  

• Fixture mounting - double mount.  

• Pole-Type P-l, aluminum, mill finish, galvanized steel, fixture mounting height forty feet (40').  Pole spacing shall be one hundred twenty feet (120') on center typical.  

• Fixture - Type F-1, aluminum, mill finish.  

• Base - Type B-2 (see below).  

• Photocells.

• Recommended lighting level - 1.5 minimum average maintained horizontal footcandles.  

• Unsignalized intersections shall have four (4) Type P-I light poles, one on each corner.  Each of them shall have a single mount fixture Type F-1.  Luminaries at signalized intersections will be mounted on the signal.

Where primary streets run adjacent to a residential area, careful fixture selection and/or the use of baffles shall be exercised to prevent high lighting levels from leaking into the residential area.  

11.5.1.2 Primary Street, Undivided

lighting for pirmary street, undivided

For undivided primary streets, the street lighting poles shall be placed on both sides of the street and poles shall be paired to create a formal, rhythmic pattern.  Lighting for this street shall have the following characteristics:

• Lamp type - high-pressure sodium.

• Fixture mounting - single mount. 

• Pole-Type P-l, aluminum, mill finish, galvanized steel, fixture mounting height forty feet (40').  Pole spacing shall be one hundred twenty feet (120') on center typical.  

• Fixture - Type F-1, aluminum, mill finish.

• Base - Type B-2.

• Photocells.

• Recommended lighting level - 1.5 minimum average, maintained horizontal footcandles.

• Unsignalized intersections shall have four (4) Type P-1 poles, one on each corner.  Each of them shall have single mount fixture Type F-1.  Luminaries at signalized intersections will be mounted on the signal.

Where primary streets run adjacent to a residential area, careful fixture selection and/or the use of baffles shall be exercised to prevent high lighting levels from leaking into the residential area.

11.5.1.3 Secondary Streets

lighting for secondary street

For secondary streets, the street lighting poles shall be placed on both sides of the street and poles shall be paired to create a formal, rhythmic pattern.  Lighting for this street shall have the following characteristics:

• Lamp type - high-pressure sodium or metal halide.

• Fixture mounting - single mount.

• Pole - Type P-1, aluminum, mill finish, galvanized steel, fixture mounting height, twenty-five feet (25').  Pole spacing shall be one hundred twenty feet (120') on center typical.

• Fixture - Type F-1, aluminum, mill finish.

• Base - Type B-2.

• Photocells.

• Recommended lighting level - 1.0 minimum average maintained horizontal footcandles.

• Unsignalized intersection shall have two (2) Type P-1 poles located at opposite corners.  Each of them shall have a single mount fixture Type F-1.  Luminaries at signalized intersections will be mounted on the signal.

Where secondary streets run adjacent to a residential area, careful fixture selection and/or the use of baffles shall be exercised to prevent high lighting levels from leaking into the residential area.

11.5.1.4 Tertiary Streets and Cul-de-sacs

lighting for tertiary streets and cul-de-sacs

These streets shall receive the lowest level of illumination.  The street lighting poles shall be placed on only one side of the street. Lighting for these streets shall have the following characteristics:

• Lamp type - color corrected mercury vapor.

• Fixture mounting - single mount.

• Pole - Type P-1, aluminum, mill finish, galvanized steel, fixture mounting height twenty-feet (20').  Pole spacing shall be one hundred twenty feet (120') on center typical.

• Fixture - Type F-1, aluminum, mill finish.

• Base Type - B-2.

• Photocells.

• Recommended lighting level, 0.5 minimum average maintained horizontal footcandles.

Intersections shall have one (1) Type P-1 pole, which shall have a single mount fixture Type F-1.

11.5.1.5 Traffic Signals

Traffic signals shall be provided at any intersection where deemed necessary by the post authorities having jurisdiction over such matters.  Where traffic signals are provided, the following characteristics shall apply:

• Poles - Type P-1, aluminum mill finish or galvanized steel (semi gloss black finish Federal Color 27038, Arapaho County, CO standard when used to support traffic signals).

• Depending on the intersection size, a minimum of two (2) poles, up to a maximum of four (4) poles, shall be provided at signaled intersections.  Where two (2) poles are used, each pole shall support two (2) horizontal mast arms for signal support.  The mast arms shall typically be set at ninety degrees to each other to control traffic in two directions.  The two poles shall be provided at opposite intersection corners.  Where four (4) poles are used, one (1) shall be provided at each intersection corner to control traffic in one direction, using one (1) mast arm per pole.

• Pole size shall be sufficient to support all needed traffic signals and mast arms without being guyed or staked.

• Mast arms and all appurtenances shall be of material and finish to match the pole.

• Street lighting fixtures shall typically be mounted onto the traffic signal poles.  Fixtures shall be of types, materials, and finishes as required for street lights discussed elsewhere in this guideline.  All new traffic signals are to be LED.  Traffic controls are to be camera operated.

• Base - Arapaho County, CO Standard for signal pole used.

• Recommended lighting levels shall follow those required for the three levels of the street hierarchy.  Intersections involving primary streets shall be lighted as required for primary street intersections.  Similarly, secondary streets lighting levels shall take precedence over a tertiary street level at intersections where the two cross.

• Traffic signals shall not be suspended on cables stretched across the intersection.

Crosswalk signals and user controlled buttons shall be provided at intersections involving pedestrian and/or bicycle traffic.

Lighting Installation