Work zonesQuestion 182 of 223

What is the main use of portable changeable message signs in work zones?

To replace the lane lines
To show the time of day
To tell drivers about unexpected situations
To advertise nearby shops

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Correct answer: To tell drivers about unexpected situations

These signs show messages that can change. They mainly warn drivers about conditions they may not expect.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 6L.05 Portable Changeable Message Signs, page 871

Practice work zones

Questions last reviewed: 18 October 2026

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