For example, to get you started, we could consider the colour (& associations) of each light:
RED: aid, rage, bull, love, emergency, stop, alert, warning, passion, blood, luck, life, emotion, caroet, luxury, VIP;
AMBER: transition, limbo, pause, suspense, en route, evolving, caterpillar (to butterfly), bees, hive, honey, honeycomb;
GREEN: go, move forward, ahead, turn, motion, life, eco-friendly, envy, countryside, lawns, gardens, shrUbbery, trees, forests, money, planet, health;
You can mix-&-match the above words in any combination & craft your story: the spontaneously generated listing will help you select a theme, setting, scenario, plot, characters, timelines, tension, conflict, & other such characteristics that serve as the attributes of a story.
Random stimuli are excellent sources for creative combustion.
"The two most engaging powers of an author are, to make new
things familiar, & familiar things new."
~ Samuel Johnson
[excerpted & adapted slightly from the book, 'Taleblazers: Imagination to Imprint', by Dilip Mukerjea;]