How are vehicle phases typically numbered?

Vehicle phases in traffic signal systems are typically numbered from 1 through 8. This numbering convention allows for clear identification and coordination of traffic movements at intersections. Each phase corresponds to a specific combination of vehicle movements, such as left turns, straight-through movements, and right turns.

Using a numbering system from 1 to 8 accommodates a range of common traffic scenarios while still providing sufficient flexibility for various signal configurations. In many designs, this system aligns with the standard practices and regulations established in traffic engineering, ensuring that technicians and engineers can easily communicate about and manage traffic signal operations.

While there are signals with more phases in complex scenarios, such as those accommodating additional movements or pedestrian phases, the common practice is encapsulated in the 1 to 8 range for standard vehicle functions.