Unlike familiar red and blue lights, green flashing or rotating lights on vehicles serve specific, localized roles that vary by region.
They are most commonly used by volunteer firefighters, emergency medical technicians, or specialized non-emergency medical transport vehicles.
In most jurisdictions, green lights act purely as courtesy identifiers and do not grant drivers emergency privileges like running red lights.
Because laws differ widely by state and country, staying alert when you spot a green light helps keep roads safer for everyone.
