Final answer:
The safest option when intervention with an impaired driver fails is to call a cab or a ride service to avoid risking your safety.
Step-by-step explanation:
If intervention efforts prove ineffective in dealing with an impaired driver, the safest and most responsible course of action is to summon a cab or another ride service. It is paramount not to enter the vehicle with an impaired driver, as doing so jeopardizes your safety and that of others on the road. While alternative measures such as wearing a safety belt, disabling the car, or attempting to incapacitate the driver might be considered, these actions can be hazardous and are not advisable. Prioritizing personal safety and the well-being of everyone on the road is of utmost importance in such situations.