Directly affected parties include horse owners, commercial equine transporters, auction houses, racetracks, rescues, and any businesses that move horses using stacked-level motor vehicles. These parties may need to stop using multi-level stacked trailers for horses, retrofit or replace equipment, run smaller loads, or switch to single-level transport options. That will increase operational costs (equipment purchase/lease, more trips, or lower load efficiency) and may require logistical changes (scheduling, routing, temporary housing). Regulators and enforcement agencies will need to implement and apply the civil-penalty regime, and courts could see related enforcement or civil actions if the incomplete civil-action provision grants a private cause of action. Rail carriers may face related clarifications or obligations because the statute's rail-related subsection is amended, though the excerpt does not provide full detail about how rail transport of horses is affected. Animal welfare advocates will likely view the change as a welfare improvement; some transport businesses will view it as an operational and cost burden. Uncertainty in the incomplete civil-action text could create short-term legal ambiguity about remedies and procedures.