When should you adjust the Traffic Control Plan (TCP) in a work zone?

• A. When the weather changes
• B. Never adjust once created
• C. Only at project kickoff
• D. Based on monitoring results such as traffic flow and safety metrics

Answer: (D)

Adjustments to a work-zone Traffic Control Plan are made based on real-time data and observed conditions, not kept fixed after the initial setup. The plan should respond to how traffic actually behaves and how safety metrics look in practice. By monitoring traffic flow, queue lengths, speeds, incident rates, and worker safety observations, you can fine-tune lane closures, detours, signage, and flagger positioning to keep traffic moving smoothly while protecting workers. Weather can influence conditions, but the key rule is to update the TCP when monitoring results indicate a change is needed, rather than sticking to the plan from kickoff or never adjusting at all.