Portable changeable message signs; certain vehicles authorized to be equipped with signs.

Removed the 'House Substitute' header, bill tracking number, and committee attribution details, as these are no longer needed once the bill is finalized.

Added the 'Enrolled' header, 'Virginia Acts of Assembly' citation, and 'Approved' status to indicate the bill has passed all legislative stages.

Reordered the conditions for using portable signs to explicitly state that compliance with all state and federal laws is the primary requirement, followed by the duty of the vehicle.

Added a specific restriction requiring vehicles authorized to use flashing amber lights to remain stationary when the portable changeable message sign is activated.