Green warning lights are showing up on more snow plows and highway maintenance trucks every winter — and there's a reason. Studies cited by several state DOTs found the human eye picks up green faster and more clearly than amber alone, especially in snow and low light. Over the last few years, a growing list of states changed their vehicle codes to allow green lights alongside traditional amber on qualifying vehicles. This guide breaks down where green-and-amber setups are permitted, who's actually allowed to run them, and what to check before you buy.
One thing up front: in every state we cover, green is permitted as an addition to amber — not required, and not a replacement for it. The rules also limit which vehicles qualify, usually highway maintenance, snow and ice removal, and in some states private contractors doing that work. Always confirm your state's current statute and your specific use before equipping a vehicle.
Why states are adding green to the amber standard
Amber has been the standard warning color for tow trucks, plows, and maintenance vehicles for decades. Green is the new addition. The logic is visibility: green sits near the peak of human eye sensitivity, so a green-and-amber light bar tends to stand out against headlights, brake lights, and a wall of white snow better than amber by itself. That's why the typical law lets you add green to an existing amber setup rather than swap it — you keep the recognized amber signal and gain the extra visibility.
Where green and amber lights are allowed
The table below is a quick reference. Each state links to a detailed breakdown with the statute, who qualifies, and the fine print. Rules change, and most of these are recent, so treat this as a starting point and verify the current code before equipping a vehicle.
|
State |
Green + amber allowed? |
Who generally qualifies |
|
Michigan |
Yes |
Highway repair/maintenance incl. private construction, snow/ice, spill response |
|
Maryland |
Yes |
State/local fleets and their contractors; snow removal or worker protection |
|
Maine |
Yes |
Municipal public works; DOT/Turnpike-directed vehicles |
|
Pennsylvania |
Yes (temporary) |
Township highway construction/maintenance and contractors |
|
New York |
Yes |
Municipal snow/ice vehicles (state, county, city, town, village) |
|
New Jersey |
Pending confirmation |
Municipal snow/ice; possibly NJDOT contractors |
|
Ohio |
No (amber only) |
Green not authorized for maintenance vehicles |
What to check before you buy
Three things decide whether a green-and-amber light is a legal fit for your situation:
Your vehicle and job. Most laws tie the green allowance to a specific activity — plowing, sanding, highway maintenance, utility work. A light that's legal on a township plow may not be legal on a personal pickup.
Whether you're public, private, or under contract. Some states limit green to government-owned vehicles. Others extend it to private contractors doing the work. This is the detail that trips people up most.
The amber requirement. Green almost never stands alone. In most states it's only legal while your amber lights are also active. Buy a setup that gives you both.
Shop Better-Viz amber and green warning lights
Better-Viz amber/green LED warning lights come in the mounts most maintenance and plow trucks actually use — surface-mount pods, grommet-mount ovals, and dual-layer beacons for pole or roof mounting. Same amber-and-green output across the line; you're choosing the size and mount that fits your truck.
Shop all Better-Viz amber/green warning lights → collection
Frequently ask question
Are green warning lights legal in my state?
It depends on the state and the vehicle. As of now, states including Michigan, Maryland, Maine, Pennsylvania, and New York permit green alongside amber on qualifying maintenance or snow-removal vehicles. Ohio does not. Check your state's page for the specific rule and confirm the current statute before equipping a vehicle.
Can I run green lights by themselves?
In almost every state that allows green, no. Green is permitted only in addition to amber, and usually only while the amber lights are also on. Run them together.
Do these laws require me to install green lights?
No. Every state we cover treats green as optional — a permitted upgrade for better visibility, not a mandate.
Does green mean the same thing as an emergency vehicle's lights?
No. Green-and-amber on a maintenance or plow truck is a caution signal telling drivers to slow down and move over. It's not the red or blue of a police, fire, or EMS emergency vehicle, and it doesn't grant the same right-of-way.
What color light do I actually need for a snow plow?
Amber is the long-standing standard for plows and maintenance vehicles in most states. Where green is allowed, it's added to amber for extra visibility. A combination amber/green light covers both.
