Can variable message panels be used to give mandatory instructions?

Can variable message panels be used to give mandatory instructions?
A)No, they are merely informational.
B)No, they can only be used to warn of possible hazards.
C)Yes, among other uses.Correct
Variable message panels are intended to regulate traffic, adapting it to changing traffic conditions. They are used to:
- Provide information to drivers.
- Warn of possible hazards.
- Give recommendations or mandatory instructions.