What is the correct initial action at a tanker truck rollover with a gas spill?

In the scenario of a tanker truck rollover with a gas spill, the most appropriate initial action is to notify the hazardous materials team and control access to the scene and the patient. This is correct because a gas spill poses significant hazards, including the risk of fire or explosion. By controlling access to the scene, responders reduce the likelihood of injury to bystanders and ensure that only qualified personnel are in the vicinity.

Moreover, notifying the hazardous materials team is essential in managing the situation safely, as they have the expertise and equipment necessary to handle potentially dangerous substances. The priority must be to secure the area and ensure safety for everyone involved before any attempts to extricate patients or stabilize the vehicle occur.

The other options suggest actions that either do not prioritize safety effectively or assume that extrication of the patient can occur in a high-risk environment without first managing the spill and securing the scene, which could lead to further complications or risks.