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Section 3: Plan Standards

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Introduction

This section explains some of the standard practices used in TxDOT highway illumination plan layouts.

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Scale of Plans

Generally, a scale of 1:100 provides plenty of detail for lighting layouts. Underpass lighting sometimes requires 1:50. Other special lighting systems, such as tunnel lighting, may require more detailed layouts.

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Boring Logs

High mast lighting layouts should include soil boring logs. See the Geotechnical Manual (Bridge Collection) for details.

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Standard Plan Symbols

TxDOT has developed standard illumination symbols to aid in plan preparation. Figure 6-1 and Figure 6-2 explain these symbols.

 Standard symbols for light poles used by
TxDOT in plan preparation.  Note that breakaway transformer base
poles are represented by a square, and non-breakaway (or “shoe base”)
poles are represented by a small circle.) (click in image to see full-size image) Anchor: #i999576grtop

Figure 6-1. Standard symbols for light poles used by TxDOT in plan preparation. Note that breakaway transformer base poles are represented by a square, and non-breakaway (or “shoe base”) poles are represented by a small circle.)

Other Symbols:

 Other standard illumination symbols used
by TxDOT in plan preparation. (click in image to see full-size image) Anchor: #i999580grtop

Figure 6-2. Other standard illumination symbols used by TxDOT in plan preparation.

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Typical Plan Layout

Figure 6-3 shows a typical TxDOT illumination plan layout, illustrating the typical features, which include:

  • a legend explaining the symbols used
  • conduit and conductor run table
  • table of roadway illumination assembly types and locations (including any special notes that pertain to each pole)
  • plan sheet overall layout and scale
  • sheet summary table
  • electrical service data table.

 Typical illumination plan layout. (click in image to see full-size image) Anchor: #i999588grtop

Figure 6-3. Typical illumination plan layout.

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