Division 13-12-003
Lighting Layout
Sections:
13-12-003-0001 Lighting Layout
13-12-003-0002 Streetlights at Intersections
13-12-003-0002.1 General
13-12-003-0002.2 Streetlights at Nonsignalized Intersections
13-12-003-0002.3 Streetlights at Signalized Intersections
13-12-003-0003 Spacing of Streetlights
13-12-003-0004 Location and Placement of Equipment
13-12-003-0001 Lighting Layout
The intent of roadway lighting is for improved transportation safety and efficiency. The individual elements that compose the lighting installation shall complement this intent. The street lighting design shall include safety considerations to minimize hazards presented by poles as roadside and pedestrian obstacles, and as vision obstructions. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-12-003-0002 Streetlights at Intersections
13-12-003-0002.1 General
A. Luminaire Wattage – Single Installation. The size (wattage) of a streetlight at an intersection where only one (1) light is required is determined from Table 13-12-003-01 based on the functional classification of the street over which the light extends.
B. Luminaire Wattage – Multiple Installation. At intersections where more than one (1) streetlight is required, all lights shall be the same size. The size shall be determined from Table 13-12-005-01 for the functional classification of the leg of the intersection requiring the highest wattage luminaire. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-12-003-0002.2 Streetlights at Nonsignalized Intersections
A. A streetlight shall be installed at each nonsignalized public street intersection with the following exceptions:
1. Street Width. At intersections where the width of one (1) or more of the approaches is greater than or equal to fifty (50) feet as measured to the back of curb (on urban street sections) or edge of pavement (on rural street sections), two (2) streetlights shall be installed on diagonally opposite corners.
2. Urban Local Streets. At the intersection of two (2) urban local streets, a streetlight may be omitted if its installation would violate the spacing and uniformity criteria of Section 13-12-003-0003 along either street.
3. Rural Local and Rural Collector Streets. Streetlights are not required at intersections involving only rural local or rural collector streets. Should a designer choose to install streetlights on streets with these classifications, then the respective urban local or urban minor collector street criteria for intersections and spacing along the streets shall apply. Streetlights are required at all intersections on rural arterial streets.
B. Streetlights at unsignalized intersections shall be installed near the curb return with the luminaire extending perpendicular to the street centerline. The luminaire shall extend over the continuous roadway at a "T" intersection or over the roadway with the higher classification at a four (4) way intersection. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-12-003-0002.3 Streetlights at Signalized Intersections
Streetlights shall be installed on the signal poles at signalized intersections as follows:
At a minimum, four (4) streetlights shall be installed, one (1) on each corner of the intersection. For every leg of an intersection where the width of the leg is greater than or equal to eighty (80) feet, measured at the curb returns, an additional streetlight will be installed. The additional streetlight shall project over the right hand curb on that approach. (Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-12-003-0003 Spacing of Streetlights
In addition to intersection locations, streetlights shall be spaced along streets in accordance with the following table (Table 13-12-003-01):
|
FUNCTIONAL CLASSIFICATION |
SIZE (watts) |
TYPE |
LUMENS |
SPACING |
|---|---|---|---|---|
|
MAJOR ARTERIAL |
180 |
LPS |
33K |
300' |
|
|
135 |
LPS |
22.5K |
250' |
|
MINOR ARTERIAL |
180 |
LPS |
33K |
300' |
|
|
135 |
LPS |
22.5K |
250' |
|
MAJOR COLLECTOR |
135 |
LPS |
22.5K |
300' |
|
|
90 |
LPS |
13.5K |
250' |
|
MINOR COLLECTOR |
90 |
LPS |
13.5K |
300' |
|
|
55 |
LPS |
8K |
300' |
|
COMM. LOCAL |
55 |
LPS |
8K |
300' |
|
LOCAL |
55 |
LPS |
8K |
300' |
|
Note: When streetlights are constructed along an existing street, the wattage and corresponding spacing shall match that of existing lights on the street, or this table, whichever is more restrictive. On new street construction, the designer shall select the most appropriate wattage and spacing from this table based on intersection spacing, driveway locations and other roadway features that would benefit from street light proximity. |
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(Ord. 2017-22, Rep&ReEn, 07/05/2017)
13-12-003-0004 Location and Placement of Equipment
A. In addition to the table, the following layout criteria shall be used:
1. When a streetlight location falls near an unlit intersection, the light shall be located at the intersection.
2. Streetlights should be located at property lines to the greatest extent possible, but not in conflict with other utility service locations.
3. Pole spacing along a street may vary from the criteria of Table 13-12-003-01 by up to ten percent (10%), provided the spacing does not exceed three hundred (300) feet. For uniformity of appearance, the variance in spacing between adjacent spans should not be more than ten percent (10%).
4. With relation to roadway cross-sections, poles shall be located as follows (measured to the near edge of the pole):
a. If either the sidewalk is at the back of curb or the parkway is less than four (4) feet wide, one (1) foot from back of sidewalk.
b. When the sidewalk is separated from the curb by a parkway greater than or equal to four (4) feet in width, two (2) feet back of curb.
c. When there is curbing but no sidewalk, two (2) feet from back of curb.
d. On a rural street, eight (8) feet from the edge of pavement with a widened shoulder similar to the fire hydrant location in standard drawing 13-03-012.
5. Existing utility poles should be used whenever possible.
6. Wiring for streetlights shall be underground and located behind curb.
7. Additional lighting may be required when potential traffic hazards are identified in the plan review process.
8. On streets that are wider than seventy (70) feet (back of curb) the required streetlights shall alternate on either side of the street. (Ord. 2017-22, Rep&ReEn, 07/05/2017)