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City of Laredo Downtown Area Street Lighting Upgrade

Stakeholder Goals

Decorative lights

Historical theme

Security

Banners

Cost

Existing Lights

Mixture of decorative and cobrahead lights

Mixture of City and AEP owned lights

Installed on an as needed/requested basis

Banners

AEP Banner policy limits attachments

No through bolts or banner arms allowed

Only banded attachments are permitted

11’ vertical clearance from bottom of banner to sidewalk required by NESC and enforced by AEP

No pole to pole or pole to structure attachments

Existing Lighting Data

Photometric patterns are available for different types and wattages of lighting.

The patterns were obtained for the cobrahead and acorn lights that are in use in the CBD.

There should be some overlap between the light patterns to reduce dark spots.

These photometric patterns were overlaid onto the map of the CBD.

ANSI/IESNA Rp-8-00- Roadway Lighting

Lighting standard identifies appropriate lighting levels for roadways.

Standard is based on roadway type and pedestrian traffic.

Local, Collector, Major, Expressway, Freeway

All of the roads in the CBD are assumed to be local roads, with all intersections being local/local.

Pedestrian Traffic

Pedestrian traffic is identified as low, medium, or high in the lighting standard.

Low: 10 or fewer

Medium: 11-100

High: over 100

Standard is only concerned with pedestrian traffic after dark, daytime is not considered.

All roads are assumed to have a medium level of pedestrian traffic.

Recommended Illumination Levels

Type

Roadway Classification (R3)

Pedestrian Confict Area

Minimum Maintained Average Illumination (Foot Candles)

Roadway

Local

Medium

0.7

Intersection

Local/Local

Medium

1.4

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