What does a flagger do?

A flagger’s main role is to communicate with drivers using standardized hand signals, stop/slow paddles, or automated devices to control vehicle flow. They often work in pairs, coordinating at each end of a work zone to maintain smooth traffic movement. Their presence reduces the likelihood of accidents, particularly when visibility is limited or drivers need to navigate abrupt changes.

How long can a flagger stop traffic?

Flaggers are trained to keep delays to a minimum, but the length of a stop depends on the work being done and overall traffic volume. In most cases, a flagger will stop traffic for a few minutes to allow construction vehicles to pass or to alternate the flow of traffic through a single-lane section. Local regulations may also set maximum delay times to prevent congestion.

What is the speed limit in a construction zone?

Speed limits in construction zones vary by state and project, but they’re generally lower than regular road speeds to protect workers and equipment. It's not uncommon to see limits reduced to 25–45 mph, especially when workers are present. In some jurisdictions, fines for speeding in construction zones are doubled, even when workers aren't immediately visible.

How do road traffic control systems work?

Traffic control systems use a combination of equipment, signage, human oversight, and sometimes intelligent technology to manage the movement of vehicles through or around work areas. This can include cones, barriers, signs, flaggers, signal controllers, and TMAs. The goal is to maintain safety while minimizing disruption. At WD Wright, our traffic control setups are carefully planned to keep people safe without unnecessary delays.

What is a construction flagger?

A construction flagger is a specialized type of flagger trained to manage traffic around roadwork and infrastructure projects. Their responsibilities include coordinating with work crews, communicating with drivers, and ensuring that traffic control plans are followed to the letter.

How long can construction stop traffic?

Construction activities that affect traffic flow must comply with local guidelines on delay duration. Typically, short-term lane closures or stoppages should not block traffic for more than 15 minutes unless pre-approved. If longer delays are necessary, traffic control plans often include alternate routes or detailed detour signage.

Do I need permits for traffic control setups?

In most cases, yes. Whether it’s a single-lane closure or a complex detour system, you’ll need permits from your local department of transportation or municipality. These permits ensure your traffic control plan complies with public safety regulations.

What is a TMA (truck-mounted attenuator)?

A TMA, or truck-mounted attenuator, is a safety device mounted to the back of a truck, typically used in highway work zones. Its primary purpose is to absorb the impact energy of a vehicle that collides with it. TMAs are designed to reduce damage and injury during rear-end crashes, protecting both workers and drivers. TMAs are especially critical in areas with moving operations like line painting or sweeping, where crews are more vulnerable to oncoming traffic.

Are TMAs required by law for certain construction projects?

In many states and jurisdictions, yes. TMAs are required by law for specific types of mobile or short-duration work on high-speed roadways. Regulatory bodies like the Federal Highway Administration (FHWA) and state departments of transportation often mandate TMAs in maintenance and protection of traffic (MPT) plans. If you're unsure whether your project requires one, consulting with a traffic control expert, like WD Wright, is a smart first step.

Can TMAs be rented, or must they be purchased?

Absolutely, TMAs can be rented. In fact, for short-term projects or contractors who only occasionally require TMA protection, rental is often the most cost-effective and convenient option. WD Wright offers TMA truck rental services tailored to your project timeline and safety needs.

What is a smart traffic management system?

A smart traffic management system uses technology—like sensors, cameras, and AI—to monitor and manage traffic flow in real-time. These systems are especially valuable in urban areas or complex work zones, where dynamic traffic control can minimize congestion and increase safety. Smart systems can adjust signal timing, reroute vehicles, and communicate with drivers electronically.

What is Guardian SmartFlagger (AFAD)?

The Guardian SmartFlagger is an Automated Flagger Assistance Device (AFAD) that allows traffic control personnel to manage work zones from a safer, remote location. This system replaces manual flagging in certain situations, reducing worker exposure to live traffic and improving safety outcomes.

Can one person control multiple SmartFlagger units?

Yes, a trained operator can control multiple Guardian SmartFlagger units simultaneously. This is ideal for longer work zones or setups requiring coordination at several points. The system is designed to be intuitive and responsive, making it an efficient and safe solution for dynamic traffic conditions.