What distinguishes temporary traffic control devices from permanent ones?

• A. Temporary devices remain after project completion.
• B. Temporary devices are used during construction/maintenance; permanent devices remain after.
• C. Temporary devices require electricity; permanent do not.
• D. Temporary devices are only for pedestrians; permanent for vehicles.

Answer: (B)

Temporary traffic control devices are placed to manage traffic and protect workers during a construction or maintenance activity, and they are removed once the work is finished. Permanent devices, on the other hand, are built into the roadway system and stay in place for long-term traffic management after the project is completed. This is why the statement that captures the distinction is that temporary devices are used during construction or maintenance and permanent devices remain after.

For context, you’ll see temporary devices like cones, barrels, portable signs, and movable barriers in work zones, whereas permanent devices include fixed signs, permanent lane markings, guardrails, and fixed lighting. The other options mischaracterize the nature of temporary devices: they aren’t required to stay after completion, many do not require electricity, and they aren’t limited to pedestrians.