A flashing green light is not a universal sign of patient transport, and it does not automatically give a vehicle priority. In some jurisdictions, it identifies volunteer firefighters or other authorized responders; elsewhere, green lights have different permitted uses. Depending on local rules, the light may be a courtesy request rather than a legally enforceable demand to yield. Behind it could be someone heading to help a person in distress, but the color alone cannot tell you the vehicle’s mission.
The safest response begins with staying calm and checking your surroundings. Avoid braking abruptly, swerving, or entering an intersection against a signal. Where safe and appropriate, make room for the vehicle while following local traffic laws. Learning what green warning lights mean in your area removes uncertainty before an encounter happens. That small preparation can protect everyone nearby while helping authorized responders reach people who may urgently need their care.