What should be done with a PCMS when it is not in use?

When a Portable Changeable Message Sign (PCMS) is not in use, placing it outside the clear zone or shielding it is the most appropriate action to take. The clear zone is an area immediately adjacent to the edge of the traveled way that is intended to provide a recovery area for errant vehicles. By positioning the PCMS outside this zone, you ensure that it does not become a hazard for drivers.

If the sign were left on the roadway or simply turned off and visible, it could distract or confuse motorists, potentially leading to an accident. Moving it to a storage area might be a viable option, but it does not provide the immediate precautionary action necessary to enhance safety while not in use. Therefore, the correct choice emphasizes both safety and the need to minimize potential risk to drivers and their vehicles. This practice aligns with safety standards aimed at reducing conflicts on the roadway.