Which of these incidents would NOT need to be reported within 24 hours?

The incident involving a crew getting into a car accident on the way to a site is the one that would generally not need to be reported within 24 hours to regulatory authorities. This is because vehicle accidents that occur off-site and not directly related to the work being performed typically fall outside the immediate purview of workplace safety reporting requirements.

In contrast, incidents like a worker falling from scaffolding, exposure to toxic substances, or severe injuries requiring hospitalization all directly impact the worksite and have immediate implications for worker safety. Such events require prompt reporting to ensure that appropriate measures are taken to protect other workers, investigate the cause, and prevent future occurrences. These regulations are in place to enhance safety protocols and facilitate quick responses to potentially hazardous situations within the workplace.