Vehicles with red and blue lights are usually law enforcement vehicles.
You can only have red lights on the rear of your car. And blue lights are illegal to use on any car on the street they are only for emergency vehicles blue lights are for police only
Red and Blue for law enforcement vehicles.
Blue
You can put blue film over your headlights but you can not change the lights to be blue. It is illegal. Only emergency vehicles can have blue or red lights.
Varies by jurisdiction. Some use only red lights, and reserve blue solely for other purposes (e.g., all first response vehicles in NY use red - blue is used by firefighters in their own vehicles, and green is used by paramedics in their own vehicles).
In the United States, police vehicles typically use blue and red lights as standard colors for emergency response. Blue lights are primarily used to indicate police presence and alert other drivers, while red lights are often associated with emergency vehicles. Some jurisdictions may also incorporate white, amber, or green lights for specific purposes, but blue and red remain the most common combinations across the country.
Not usually, but you can tint your headlights red (NOTE: This is against the law)
Main reason is colorblindness alert,then is what the law enforcement has adopted from the beginning of time,on vehicles:blue stands for law enforcement,red is for emergency vehicles (including police cruisers),yellow caution...and green is for security officers. Blue/red police. Red/yellow fire/ems.Green/amber for Security officers. As all traffic lights are designed to be useful on both normal eye and color blind humans so are the emergency vehicles lights.
To help people with colorblindness the "green" light has a mixture of green and blue. I think they the new lights have more blue than the older ones.
If it's a state or county vehicle doing road repairs then flashing lights are to be on but should not be red - they should be amber and/or clear.Added: Red (or blue) flashing lights are reserved for use on authorized emergency response vehicles only (i.e.: police - fire/rescue - ambulance).
In Alabama, it is illegal for private citizens to use blue lights on vehicles, as blue lights are reserved for authorized emergency vehicles. The use of blue lights by non-emergency vehicles can lead to fines and legal penalties. However, certain exceptions may apply for specific vehicles or under certain conditions, so it's always best to check local laws for detailed regulations.
Headlamps have red lights to serve as rear fog lights on vehicles. These red lights help improve visibility in foggy conditions for other drivers on the road, making it easier to see the vehicle from behind.