Traffic Signal Pole Height Calculator

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Introduction

Pole height and arm reach affect clearance and visibility. Determine them from the approved road layout, signal dimensions, mounting arrangement and structural requirements. This guide discusses the information needed for project-specific review rather than a universal formula for every urban or rural installation.

Mounting Height Formula

Determine signal clearance and mounting height from the applicable road requirements and approved installation drawing. Account for the head’s full dimensions, bracket arrangement and its position relative to the arm. Have the responsible designer verify vehicle clearance and visibility; do not apply generic urban-road or truck-route heights without the project requirements.

Define road level, required clearance, the lowest equipment point, arm elevation and total pole height on the approved drawing. Derive each dimension from those reference points; nominal lens diameter is not the complete signal-head height.

Confirm available GAOQIAO pole heights against the approved mounting and clearance requirements. Do not treat a single mounting height as a universal standard for arm-mounted vehicle signals.

Arm Length Formula

Determine the arm reach from the approved signal position, road geometry and clearances. Confirm the required length rather than assuming it always reaches the far-lane centreline:

Determine arm length from the approved lane layout, pole position, required signal position and structural design; do not use lane count alone as a universal formula.

For a 4-lane road (2 each direction) with 3.5 m lanes, 0.5 m kerb offset and 0.5 m setback:

Illustrative horizontal geometry: (4 × 3.5) / 2 + 0.5 + 0.5 = 8.0 m. Confirm that lane widths, offsets and reference points match the approved project drawing; this example is not a universal arm-length formula.

Confirm available arm lengths with GAOQIAO for the selected pole system. Standard or custom geometry must be checked against the approved equipment loads, site conditions and structural design.

Worked Example

Confirm the required mounting height, arm reach and project-specific foundation drawing with GAOQIAO before ordering.

Featured Products

GAOQIAO supplies vertical poles, signal arm poles and double-arm poles in standard and custom sizes. See the pole selection guide.

Conclusion

Determine mounting height and arm reach from the approved road layout, clearance requirements and structural design. Include signal dimensions, mounting offsets, lane geometry and site loads rather than applying a generic formula. Send the project drawings and requirements to GAOQIAO to confirm available pole configurations and the scope of any design support; do not assume standard sizes suit every intersection.

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Frequently Asked Questions

What if my road is wider than the longest standard arm?

Use a double-arm pole (two short arms on one foundation) or a span wire across the road. GAOQIAO supplies both.

Can I get a custom arm length?

Ask GAOQIAO to confirm the available arm length, structural design and lead time for the specific project. A proposed 12 m arm requires project-specific load and foundation verification; do not assume availability or a fixed 2-4 week lead-time addition without an agreed quotation.

What about vertical clearance for tall vehicles?

Determine the required vertical clearance under the signal-support assembly from the applicable road rules, vehicle envelope and approved structural design. Confirm the actual pole and arm drawing, including deflection and installed equipment, rather than relying on a universal urban-road or truck-route height.

Relevant GAOQIAO products

These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.

Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
LED traffic signal heads200mm, 300mm and 400mm signal heads; confirm the selected model and applicable project requirements.
Signal polesVertical, signal arm and double-arm poles; confirm suitability for the approved site design.
Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.

Related buyer resources

Discuss traffic signal pole height requirements

Related guides: poles and installation

Continue with these related resources for your traffic signal project.

Traffic Signal Pole Height and Arm Length Selection Calculator