Massachusetts has pretty much the same laws as NC. The laws were not created when there was such a thing as Demo cars.
We are a working Tow Company that sells Feniex and more over custom set ups. So were covered for Demo Feniex Warning Lights in Mostly Amber, few green here and there rarely white. I have mentioned it before how much trouble you could get in no matter your light color is dependent on how you engage traffic. Dont know if this answer is off subject, but if a Wrecker truck displays Amber mixed with white, well amber aint going to get you nothing, but white will get traffic to move over for you. Now a slow moving wrecker truck doesnt really engage traffic, but having the white alternating or doing whatever lights will get 80% of vehicles to react to moving over even at slow speeds in Mass. You dont see cops raising hell with towers because they are not engaging traffic like an emergency vehicle does in aggression, but there are a few hat get unwanted yet warranted attention!
There as been no law that i know of passed here for white alternating lights, but im told the bill is before the judiciary because of a decade of wackers in old police cars and wannabe cops using them to pull people over and commit crimes. I believe this law is on the federal level, as is Red lights. Getting back to NC quick, Blue is used by your state and went and created such a law, but in Mass Blue lights are highly the biggest no no, but in fact the law is as the federal law in all states, RED is the top illegal in every state facing forward. Blue is a state only law, the Federal Government has never recognized Blue as an official color. getting back to Red, red can be displayed on wreckers facing the fron by state law choice over federal law in the North West states i think Oregon, Idaho, and maybe Washington im told.
In Mass if you get caught with a blue facing any direction, your car is IMPOUNDED until removed, plus you get a form of impersonation charge, only a State Level Felony. The Mass State police Commander for the DOT unit sais that a Demo vehicle engaging traffic would warrant the same fate minus removal of the equipment if it is in fact a legal business in the Commonwealth. The operator themselves would receive the max charges of impersonation and multi felony charges of the "your fucked" kind. But what is funny in Mass, Red lights are Fire Truck colors. If you get caught with Blue and not engaging traffic its just a ticket and impound until removed. But if you display red even parked, you will be executed on the spot lol.
All Blue lights laws are state level only, in New York their Trash Trucks have Blue Lights! Their Snow Plows have Blue and Amber, their police is all Red.
We recently built a Dodge Magnum in All Blue and Red lights, it makes the cop cars look silly with what we got on it. BUT we did like the State Police told us, in Bold Large Letters on the sides it sais " POLICE DEMONSTRATOR VEHICLE" Were not a huge sales place, even installing things gets "iffy" lol we love lights and do alot of What if or custom set ups suggestion for Police, Fire, EMS and Utility. We were hoping our new demonstrator car show well to the local agencies.
Interesting though on this subject. One of the Company longest employees an older wrecker driver knows nothing about lights, he dont even know how to turn them on in his own truck, was driving the Demonstrator car and leaned on the Feniex 4200 in the center console. Drove around a city to post office, down town, running around doing errands, never thought why the center console was all red instead of green. He knew enough the 4200 has bright green lights when he drives it. He was turning the car on and off at every stop, (its wired to the ignition not to activate any power when its off).So hes turning the car on and off at every stop when he gets out theres nothing flashing (side note too, there is no internal flashing lights, we built the car to display everything on the outside and never to interfere with the driver which the cops are liking more and more these days). This guy drove the car around town for ours wondering why people were staring at him a few flipped him off but he said every light he pulled up to (traffic signal) th cars all moved aside but he wouldnt pass them, he was thinking he was not hearing a fire truck or not seeing a police car with no sirens on. He pulled into our parking lot with a crew of guys asking out loud "WTF is he doing?" with a City police car and a State Trooper in tow with all their lights flashing. Guy had no clue they were behind him, they aid they had just started tailing him. Long story sort he cruising around and the Trooper noticed him, knew him and had an idea he had no clue the lights were flashing. Trooper told us he been all over town with the blue lights flashing and never engaged traffic and never got over 15 mph around town. He said the local PD and him have been having fun with his 1 car parade for at least an hour. They wouldve stopped him if he got on the highway. The trooper said he and the local cop decided to join his parade for the last 1/2 a mile. They said they couldn't stop laughing because they knew he had no idea the lights were on .
We thought about the set up for a bit and didnt realize ourselves. The lights re programmed on the new Feniex 4200 and although it is on the ignition. When you deactivate power like the ignition, all the push buttons will reset to off but the P slider will not. when he leaned ont eh panel he slid the P button to CODE 3 all the way right, every time he turned ignition off the lights went off, every time he cranked back up, they all came back on! Now we have an master override switch mount on the top of the dash lol.
The State Police told us that the car marked as it is, was perfect and somewhat indemnifies the company overall in the end from wrong doing. There will be no mercy for a person that operates the vehicle erratic and in Code Mode engaging traffic. I would assume, that the same would apply in any state with a properly marked Demo Unit.