Final answer:
The best advice if your car is stranded in a heavy snowstorm is to stay in your car and wait for help.
Step-by-step explanation:
If your car is stranded in a heavy snowstorm, the best advice is to stay in your car and wait for help. Leaving the vehicle and attempting to walk to the nearest town can be dangerous, especially in severe weather conditions. Abandoning your car is also not recommended because it provides shelter and protection from the elements. Instead, it's recommended to stay inside the car, keep the engine running for heat, and call for assistance.