HB 603 modifies the Transportation Code to streamline school bus operations at railroad crossings. Specifically, the bill allows school buses to bypass the requirement to stop at railroad crossings equipped with functioning gates and flashing lights. These active safety measures are deemed sufficient to protect passengers without requiring unnecessary stops. However, the requirement to stop remains in effect for crossings marked as "exempt" or "tracks out of service." The bill seeks to enhance transportation efficiency while maintaining student safety at crossings that lack automated safeguards.