Traffic Lighting
A self-assessment system where learners indicate their understanding using traffic light colours: green (confident), amber (partly confident), and red (not confident), providing instant visual feedback to teacher and learner.

What is traffic lighting?
- At the end of a task, topic, or lesson, learners rate their understanding using traffic light colours
- Green means "I understand and can do this independently"
- Amber means "I partly understand but need more practice or help"
- Red means "I do not understand and need support"
- Use the colours to plan next steps and group learners for targeted support

How it works
Traffic lighting uses the universally understood red-amber-green system for self-assessment. Learners rate their confidence or understanding by colouring a circle, holding up a coloured card, or placing a coloured dot on their work. The visual nature of the system means the teacher can scan the room and see the distribution instantly.
Traffic lighting can be applied to individual learning objectives, whole lessons, homework tasks, or longer units. At its simplest, learners colour a traffic light in the margin of their book next to each learning objective. Over time, a sequence of traffic lights creates a visual record of progress: red turning to amber turning to green tells a powerful story.
The system's value depends on honesty. Learners must feel safe showing red without fear of judgement. Building a culture where red means "I need help" rather than "I have failed" is essential. Some teachers reinforce this by saying: "Red is the most useful colour because it tells me exactly what to teach next."
Traffic lighting is most effective when it leads to action. If learners show amber or red and nothing changes, they learn that self-assessment is pointless. Use the colours to form groups: green learners work independently or become MKOs, amber learners get reinforcement, and red learners get focused reteaching.
Classroom example
A Year 7 Mathematics and Numeracy class in a Caerphilly school is learning to calculate percentages of amounts. At the end of the lesson, learners traffic-light three objectives: "I can find 10% of a number" (mostly green), "I can find 25% of a number" (mix of green and amber), "I can find any percentage of a number" (mostly amber with some red). The teacher uses this to plan the next lesson: a quick recap of 25%, then focused teaching on the general method for the amber-red group while the green group tackles extension problems.
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Traffic lighting develops the "Reflect" strand of thinking skills by building regular, honest self-assessment into classroom routine. It supports a stage-not-age approach by helping teachers identify individual starting points and plan responsive teaching across all AoLEs.
Rainbow Curriculum's Thinking Tools lens helps you plan where self-assessment routines are embedded across your curriculum, ensuring that learner confidence is regularly monitored and acted upon.
Tips
- Use traffic lighting consistently across subjects so it becomes an automatic habit.
- Respond to the colours visibly. If learners see that red leads to support, they will be honest.
- A common pitfall: only traffic-lighting at the end of the lesson when there is no time to respond. Mid-lesson traffic lighting allows immediate adjustment.
- Combine with learning logs so learners record not just their colour but why they chose it.
- Track traffic light patterns over time to show learners their progress journey.
Source: Adapted from "How to develop thinking and assessment for learning in the classroom", Welsh Assembly Government, Guidance 044/2010.



