Which statement is true regarding arrow boards and portable changeable message signs?

The statement that only arrow boards require conspicuity tape is accurate. Arrow boards are specific traffic control devices used to direct traffic or indicate work zones. They are often designed to enhance visibility, particularly in low-light conditions, and conspicuity tape serves to increase their recognition and effectiveness further. This tape reflects light, helping to ensure that motorists can see the device from a distance, thereby improving safety.

On the other hand, portable changeable message signs typically do not require conspicuity tape as they are designed to convey messages clearly under a range of visibility conditions. Their primary function is to communicate important information to drivers, so the focus is on clear message display rather than additional visibility enhancement through tape. Therefore, the requirement for conspicuity tape applies specifically to arrow boards while portable changeable message signs do not have this stipulation.