Red and blue lights are commonly associated with emergency vehicles, such as police cars, ambulances, and fire trucks. The red light typically signifies urgency or danger, while the blue light is often used to indicate law enforcement presence. These colors are easily recognizable and help alert the public to move aside for emergency responders. In many countries, the use of red and blue lights is regulated by law. Emergency vehicles are required to use these lights when responding to incidents, ensuring they can navigate traffic safely and quickly. The combination of red and blue lights enhances visibility, especially at night or in poor weather conditions.