Question

Write a simple Enum named LightValue, which lists the phases a particular stoplight lane may be in. These states should include GREEN, RED, and LEFT_SIGNAL (we are considering yellow to be part of green). Each TwoWayRoad instance (defined below) will have its own LightValue, which should correspond to the following rules:

a)GREEN indicates that the right and middle lanes may proceed, but the left lane cannot (for both directions).
b)RED indicates that no lane may proceed (for both directions).

Answer 1

An Enum named LightValue is defined with phases including GREEN, RED, and LEFT_SIGNAL as states for a stoplight. GREEN allows right and middle lanes to proceed while RED stops all lanes. This would be used in the context of traffic light systems programming.

Step-by-step explanation:

The question asks to write a simple Enum named LightValue which lists the phases a stoplight lane may be in, with specific rules for a TwoWayRoad instance. To define this enumeration in a programming context, you would write something similar to the example below. Since specific programming language is not mentioned, I'll assume a language like Java:

public enum LightValue {
GREEN, // Right and middle lanes may proceed, left lane cannot.
RED, // No lane may proceed.
LEFT_SIGNAL // Specific signal for left lane if applicable (not defined by the question).
}

The rules for the TwoWayRoad instance indicate that when the light value is GREEN, the right and middle lanes are allowed to proceed while the left lane cannot, and when the light value is RED, none of the lanes are allowed to proceed.