i yhinks its like that in all countruyes. Skandinavia uses all blue. u.s uses a mixture of blue and red. yellow lights are for construction ,wideload ,slowtraffic etc. I`ve heard and seen that in the us, security uses green lights.

Security does sometimes use green lights, but I also see yellow a lot (since yellow is universally known to mean "Watch out, I'm doing something weird [like being stopped on the side of the road]"). Green also can mean incident commander, so you often see it on fire chief cars.

States like California however allow blue & red underglow and LED's. Just not strobes or flashing lights of that color.

For California in particular, a steady red light facing forwards is the required lighting for an emergency vehicle, so they wouldn't let you do a solid forward-facing red light.

I hear that a lot, and it's probably a case by case scenario like with anything else. Then again they do have to sit in a ditch under a bridge all day and watch for 18-wheelers that block the passing lanes or anybody pushing their speed over 75 (which is pretty much anyone around here).

People probably say that in part because, unless you are a real criminal, the worst contact you're likely to have with police is a traffic stop (which state troopers do a ton of).

For California in particular, a steady red light facing forwards is the required lighting for an emergency vehicle, so they wouldn't let you do a solid forward-facing red light.

It's probably going to depend on placement. I had two "nose lights" that were probably half the size of a dime mounted around where my windshield wiper fluid dispensers were. I don't think those can be mistaken for emergency lights.

Yeah, probably not. If it's incredibly clear that it's not an emergency vehicle, I don't think there would likely be a problem. When you said LEDs, I was thinking bigger lights.

In the UK I've noticed that a lot of forces are starting to employ steady, rear facing blue LED beacons for some reason - Although, it makes them stand out easy like!

Here where i live in Houston, we have mostly white (though i've seen some B&W as well. Houston is the 4th largest city in the United States so we have many fleets) cruisers. in my particular county, the cruisers have Red, Blue, Yellow, and white lights. We also have a small fleet of sleek 2011/2012 model shelby mustangs, pure creamish-white, that are unmarked and are slicktops. They have Red and Blue lights only, and are typically used on the roads around our downtown area to pull people over for speeding it seems.

We also have these, dodge charger slicktops. http://farm5.static.flickr.com/4042/4572135913_9b7fe6c89c.jpg

Im just curious in whats the difference?

Does state troopers have more authority or do they have a bigger jurisdiction?

And also is the police all government funded or is it private funded aswell?

just wondered since the policecar design is so different from state to state and city to city.

This will vary from state to state. In Texas a Commissioned Peace Officer actually has state-wide jurisdiction when it comes to enforcing federal and state laws, regardless of the agency they work for. The State Troopers here mostly enforce traffic laws and investigate accidents, they are also responsible for security of state government buildings. State Troopers don't respond to calls of service but they will assist local agencies (ie police, sheriff, and constables) if needed.

In Georgia We're mostly blue-lighters, there are a few cities/counties that have red/blue lights, but blue is primary. The Atlanta PD has Blue lights and white secondary lighting as well.

what you also see alot in many cases where you have an all blue lightbar is you have two small red or amber light modules in the back part of the lightbar, just for more visibility from the rear, especially when stopped on the side of a busy highway.

Yellow lightbars are also used by many policing agencies to signify citizen patrol vehicles where you have non-sworn civilian workers, kind of like neighborhood watch, driving in marked vehicles. It's done so people dont confuse them for real police officers.