When you see orange warning signs ahead, slow down, stay alert, and prepare for changing road conditions. Construction zones killed 891 people in 2022 alone, and the majority of those fatalities were drivers and passengers, not construction workers. Knowing what to do before, during, and after a work zone keeps you and road crews safe.
Read the Orange Signs Early
Construction zones use orange signs with black lettering to warn you well before you reach any workers or equipment. These signs appear in a deliberate sequence, giving you time to react. The most common ones and what they’re asking you to do:
- “Road Work Ahead” is your first alert. It means obstructions or restrictions are coming, so start paying closer attention and reduce speed.
- “Lane Closed Ahead” tells you one or more lanes will end. Stay in your lane for now (more on this below), but be aware of the merge ahead.
- “Flagger Ahead” means a worker will be directing traffic with hand signals. Be ready to stop.
- “One Lane Road” means both directions of traffic will share a single lane. Expect stops and alternating flow.
- “Detour” means you’ll be rerouted to a different road entirely. Follow the posted signs rather than relying on GPS, which may not reflect the current setup.
- “Road Machinery Ahead” warns of heavy equipment operating in or near your lane.
These signs are spaced to give you reaction time at highway speeds. If you miss the first one, you’ll likely see another, but don’t count on it. Start adjusting your speed and attention as soon as you spot the first orange sign.
Slow Down Before You’re Told To
Posted speed limits in construction zones are lower for a reason: lanes are narrower, workers may be feet from your vehicle, and road surfaces can change without warning. But you should begin reducing speed as soon as you see the initial warning signs, not just when you hit the reduced speed limit sign. Sudden braking near a lane shift or merge point is one of the most common causes of work zone crashes.
Fines for speeding in construction zones are significantly higher than on normal roads. Maryland, for example, doubled its work zone speed camera fines to $80 per violation in 2024 and introduced a tiered system where fines increase based on how far over the limit you’re going. When workers are present, all fines double again. Most states follow a similar pattern of enhanced penalties.
Use the Zipper Merge Correctly
This is the part most drivers get wrong. When a sign says your lane is closing ahead, your instinct might be to merge immediately. In heavy traffic, that’s actually more dangerous. Merging early forces a sudden slowdown that ripples backward, creating bottlenecks and increasing the chance of rear-end collisions.
The safer method is the zipper merge: stay in your lane, keep pace with traffic, and merge at the designated merge point by alternating with vehicles in the other lane, one for one, like the teeth of a zipper. The Wisconsin Department of Transportation found that this approach can reduce traffic backups by as much as 40%. It also keeps everyone moving at the same speed, which cuts down on road rage and unexpected stops.
In light traffic, merging early is fine since there’s plenty of room. The zipper merge matters most when traffic is heavy and slow. If you see drivers using the “closing” lane all the way to the merge point, they’re doing it right.
Increase Your Following Distance
Tailgating in a construction zone is especially risky because stops come suddenly and unpredictably. A flagger can raise a stop paddle with almost no warning. A piece of equipment can back into your lane. The car ahead of you may brake for a pothole or uneven pavement you can’t see yet.
At speeds below 40 mph, which covers most active construction zones, leave at least one second of following distance for every 10 feet of your vehicle’s length. For a standard passenger car, that works out to roughly two seconds. Above 40 mph, add an extra second. The simplest way to check: pick a fixed point like a cone or sign, and count the seconds between when the car ahead passes it and when you reach it.
Know What Flaggers Are Telling You
Flaggers use a two-sided paddle, red on one side and orange on the other. Their signals are standardized across the country:
- Stop: The flagger faces you and holds the red “STOP” side out horizontally, with their free hand raised palm-out toward you. Come to a complete stop and wait.
- Slow down: The flagger faces you with the orange “SLOW” side extended horizontally. Reduce your speed and proceed with caution. They may wave their free hand in a downward motion to emphasize slowing down.
- Proceed: The flagger shows you the “SLOW” side and motions you forward with their free hand. Go, but stay at a reduced speed.
In emergency situations, flaggers may use a red flag instead of a paddle. A flag held horizontally across your lane means stop. A slow waving motion from shoulder height downward means slow down. A flagger standing parallel to your direction of travel with the flag lowered out of view means you’re clear to go. Never rely on a flag wave to mean “speed up.” It always means caution.
Treat flagger instructions like traffic signals. In most states, ignoring a flagger carries the same legal consequences as running a red light, with additional work zone penalties on top.
Watch for Construction Equipment Blind Spots
Dump trucks, pavers, rollers, and excavators have enormous blind spots that are far larger than anything you encounter with regular vehicles. According to visibility studies from the CDC’s National Institute for Occupational Safety and Health, operators of construction equipment often cannot see objects at ground level or even objects the height of a small adult (under 5 feet tall) in large zones around their machines.
The practical rule: if you can’t see the operator’s face or mirrors, the operator cannot see you. Give construction vehicles as wide a berth as the lane allows. Never try to squeeze past equipment that’s moving or appears to be idling. These machines can reverse, swing, or shift lanes with little warning, and their operators are focused on the work site, not on passing cars.
Driving Through at Night
Nighttime construction zones add a layer of difficulty because your depth perception drops, glare from work lights can temporarily blind you, and it’s harder to spot workers wearing reflective vests against a busy visual background of cones, barriers, and signs. Reduce your speed even further than the posted limit if visibility feels limited. Keep your headlights on low beam to avoid reflecting glare off signs and barriers back into your own eyes. Resist the urge to stare at bright work lights, which causes your pupils to constrict and makes the darker road ahead harder to see.
Lane markings in construction zones are often temporary and faded, which is harder to track at night. Follow the vehicle ahead at a safe distance and use their taillights as a guide for lane position, but don’t follow so closely that you can’t react if they stop.
Put Your Phone Away
This applies everywhere, but construction zones punish distraction faster than open highway. Lanes shift, speeds change, workers step near traffic, and new signs appear in quick succession. A few seconds of looking at your phone at 45 mph covers about 200 feet, enough to miss a lane shift, a flagger’s signal, or a stopped vehicle ahead. Many states impose separate, higher fines for phone use in active work zones.