Final answer:
2) Stop the vehicle immediately. When a vehicle on a trip is in a condition likely to cause an accident or breakdown, the driver should stop the vehicle immediately to prevent further risks.
Step-by-step explanation:
When a vehicle on a trip is in a condition likely to cause an accident or breakdown, the driver should stop the vehicle immediately. Continuing to drive in such a condition can be dangerous and can increase the risk of an accident or breakdown. Once the vehicle is stopped, the driver can assess the situation and determine whether it's necessary to call a mechanic for assistance.