Understanding Traffic Lights and Their Phases
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
A traffic light uses a universal colour code - red for stop, amber to prepare to stop, and green for go - and understanding its different phases, including flashing signals and advanced greens, is crucial for safety and law adherence.
Traffic lights are one specific, highly visible tool among the broader set of everyday traffic rules drivers follow.
The Colour Code and Phases
Beyond the basic red, amber, and green, flashing red lights require a complete stop before proceeding, while flashing amber lights signal caution rather than a full stop.
A Real-World Scenario
Seeing a light change from green to amber and correctly slowing to stop, rather than accelerating through, prevents entering the intersection after the light turns red.
Pedestrian Signals Are Part of the System
Drivers are also expected to understand and respond appropriately to pedestrian signals, which form part of the same traffic light system.