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Flagging

2 articles on flagging.

Traffic OS — a portable temporary traffic signal trailer at a rural one-lane work zone

Aug 8, 2026

Portable Traffic Signals in Work Zones: When They Beat Flaggers

Temporary portable signals can control one-lane two-way operations without putting a person in the road. Where they fit, what they cost to run properly, and the failure modes that catch companies deploying them for the first time.

Traffic OS — automated flagger assistance devices in a one-lane two-way work zone

Jul 26, 2026

Automated Flagger Assistance Devices (AFADs), Explained

What AFADs are, the two types the MUTCD recognises, the two deployment methods and when one flagger can run both ends, where AFADs are and are not allowed, and how to think about the labor and equipment economics honestly.

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