Glow Big or Go Home: Why Vehicle Lights Matter
There’s nothing worse than driving at night through a work zone and having some glaring aqua headlights coming right at you, right? At times, we are left wondering if the lights are meant for work zone safety, emergency vehicles, or if they are even legal. So, let’s explore which vehicle lights are required according to regulators and why they matter.
Understanding which vehicle lights are required and why they are necessary is more than a regulatory checkbox; it's a cornerstone of safety. These lights aren't just for visibility but are intended to communicate intent, type of vehicle, guide traffic, and protect both workers and drivers. When properly used, they reduce confusion, prevent collisions, and reinforce the presence of a temporary but high-risk zone. The ultimate goal is to reduce traffic incidents and deaths by providing appropriate, noticeable vehicle lighting on public roads.
Simple colors, simple safety!
OSHA regulations for vehicle light colors are primarily governed by the Federal Motor Vehicle Safety Standards (FMVSS) standard number 108. The standard establishes requirements for motor vehicle lighting equipment, including light colors and brightness.
The color in all lamps and reflective devices must follow Table I in FMVSS No. 108, which includes:
- White: Lower and upper beam headlamps, backup lamp, license plate lamp, and parking lamps (can be white or amber).
- Amber (yellow): Turn signal (flashing) lamps, side marker lamps, reflex reflectors, parking lamps (can be amber or white), clearance lamps, identification lamps.
- Red: Tail lamps, stop lamps, reflex reflectors, identification lamps (non-truck tractor), signal warning (flashing) lamps.
Tracking down regulations for work vehicle lighting
FMVSS isn’t the only regulator having a say in work vehicle lighting. Additional regulations designed to keep work zones safe include:
- The Federal Highway Administration (FHWA) requires proper lighting for visibility and worker safety in federally funded projects.
- Lights used for traffic control (e.g., arrow boards, beacons) must meet the Manual on Uniform Traffic Control Devices (MUTCD) standards.
- The Department of Transportation (DOT) state-specific rules for light color, placement, and usage (e.g., Wisconsin DOT may differ from Michigan DOT).
- Work vehicle lighting is enforced by the National Highway Traffic Safety Administration (NHTSA) and the Society of Automotive Engineers (SAE).
While OSHA doesn’t regulate vehicle lights directly, it mandates safe working conditions, and proper visibility in work zones. That being said, there are some OSHA standards for work vehicle lighting. Construction motor vehicles that operate within an off-highway jobsite (not open to public traffic) are covered by 29 CFR 1926.601 and must:
- Be equipped with at least two headlights and two taillights in operable condition any time visibility conditions warrant additional light; and
- Have brake lights in operable condition regardless of light conditions.
Compliance with all of these regulations is vital to incident prevention and roadway safety.
Emergency vehicle lights: Different rules for different states
Each state sets its own color patterns for emergency and service vehicles to ensure visibility and safety. Here are just a few examples:
- Michigan reserves flashing, oscillating, or rotating red and blue lights for police, fire, and EMS vehicles only. Amber lights are allowed for utility, road service, and construction vehicles. Warning lights must flash white/amber in front and amber/red in rear.
- New York differs slightly by using red, white, blue, green or amber depending on the vehicle type. Police, sheriff, and state trooper vehicles department use red, white and/or blue police lights, while fire departments in the Big Apple can’t use blue. Volunteer ambulances may use green lights while construction vehicles will display amber lights. Emergency vehicle lights may be flashing or solid.
- Florida limits blue lights to law enforcement only. Volunteer firefighters may use red or red/white combinations. Construction vehicles in high-speed zones (≥55 mph) may use green, amber, and red but only when workers are present; otherwise, vehicles use amber or white strobes.
- Texas emergency vehicles may use red, white, or blue lights. Tow trucks, service, and construction vehicles must use flashing amber lights. In snow/ice or intermittent work zones, amber and blue may be used together.
Regardless of the state, the bottom line is that flashing lights in work zones mean slow down and stay alert—lives depend on it.
Key to remember: Vehicle lighting is essential for reducing the risk of accidents in high-risk or low-visibility environments. Specific lights communicate intent and are designed to protect both workers and the public in and around work zones.















































