In the event of an accident requiring immediate medical assistance, who should be contacted?

In the context of a construction site and responding to an emergency requiring immediate medical attention, it is crucial to ensure that the appropriate emergency services are contacted swiftly.

The correct choice emphasizes contacting both the Safety Engineer, who plays a critical role in managing safety protocols on site, and 911, which is the emergency number that connects callers to police, fire, or medical assistance. This combination is essential because while the Safety Engineer can provide oversight on safety measures and help coordinate the emergency response on site, calling 911 ensures that the necessary medical help is dispatched right away.

Shortly after the emergency services, it is also vital that key personnel, such as site managers or supervisors, are informed to facilitate a good response and manage resources on site. Meanwhile, options mentioning 311 and 411 are not applicable for immediate medical emergencies, as these numbers are not designed for urgent situations but for non-emergency inquiries or general information. Thus, the proper response combines immediate alerting of emergency services along with site safety management.