Traffic Signal Color Sequence Standards: R Y G Phasing Worldwide

Introduction

Red, yellow and green indications are widely used, but permitted sequences, combined indications and timing vary with the jurisdiction and application. Signal colours are not the same as traffic-control phases. For export projects, confirm the destination’s current requirements and approved timing design; this guide identifies issues to check rather than a universal configuration.

Signal Sequences: Check Local Requirements

Traffic signals use prescribed colour sequences that vary by jurisdiction and application. Confirm the approved local sequence:

1. Red (stop)
2. Red + Yellow (about to change to green, used in some countries)
3. Green (go)
4. Yellow (caution, prepare to stop)
5. Back to Red

The sequence may include an “all red” interval between phases for safety. The duration of yellow and all-red varies by national standard.

MUTCD (United States)

MUTCD specifies:

• Yellow change interval: use the approved site-specific calculation, not a generic seconds range.
• All-red clearance interval: use the timing approved for the actual intersection; 1-2 seconds is not a universal setting.
• Distinguish the red-clearance interval from a red-plus-yellow starting indication; use only the sequence and intervals approved for the jurisdiction and controller plan.
• Pedestrian clearance: flashing don’t-walk with countdown timer

For US projects, confirm controller capabilities and programme each intersection to its approved timing plan and applicable requirements. Do not treat illustrative timing values as GAOQIAO factory defaults or as suitable settings for every intersection.

EN12368 (Europe and Export)

EN12368 specifies:

• Yellow change interval: determine from the governing local rules and approved site-specific timing assessment.
• All-red clearance: use the approved timing for the actual intersection; 1-3 seconds is not a universal value.
• Red + yellow (red/amber): used in many EU countries as a “prepare to go” indication
• Pedestrian clearance: check the destination’s countdown and timing requirements

China GB14886

China’s GB14886 uses:

• Yellow change interval: use the timing approved for the actual intersection; 3-5 seconds is not a universal setting.
• All-red clearance: use the approved timing for the actual intersection; 1-3 seconds is not a universal value.
• Red + green simultaneous: not used
• Pedestrian clearance: use the indication and countdown permitted by the adopted local rules

Confirm the required signal sequence and governing rules for the project, then verify that the selected controller supports the approved programme. Do not assume universal support for every national standard or convention variant.

Featured Products

GAOQIAO supplies traffic signal controllers and signal headswith controller configuration confirmed against the approved project requirements. See theinternational standards guide.

Conclusion

Signal sequences and timing must match the destination’s rules and the approved intersection plan. Do not select controller settings from the country name alone. Send GAOQIAO the required sequence, timing plan and interface details so that model capability and any agreed pre-configuration can be confirmed before ordering.

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Frequently Asked Questions

Does every country use red-yellow-green?

Red, yellow and green are widely used for vehicle signals, but permitted indications, sequences and exceptions must be checked against the destination’s rules. Do not assume that international conventions replace local requirements or make every signal arrangement identical worldwide.

Can a controller support multiple colour sequence standards?

Confirm the destination country’s applicable requirements before ordering. Ask GAOQIAO to verify the selected controller’s supported configuration, interfaces and compliance evidence. Do not assume that a controller can be configured to meet every standard.

What is the all-red interval for?

An all-red interval can provide clearance before a conflicting phase receives green. The responsible traffic engineer must determine its duration from the applicable requirements, junction geometry, approach conditions and approved timing design. Do not apply a generic 1-3 second interval to every intersection.

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

• Traffic Signal Controller Cabinet Guide
• Traffic Light Wiring Diagram Guide
• Traffic Light IP Ratings Guide
• Traffic Signal Head Specification Guide
• Solar Traffic Signal Site Survey
• Contact GAOQIAO

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