Where I'm at in the Midwest, that light could be miles away. It's really not possible to make a one-size-fits-all recommendation.
For what it's worth, every time I've seen first responders talk about adverse weather conditions, they say to stay with the vehicle if possible. Obviously if you're on the interstate outside of Los Angeles, you probably want to get the heck off the roadway no matter what. But if you're lost or trapped, a vehicle is much easier to spot than a pedestrian. If you're lucky enough that there's helicopters looking for you, being near the vehicle is going to drastically reduce the time it takes to find you.
For what it's worth, every time I've seen first responders talk about adverse weather conditions, they say to stay with the vehicle if possible. Obviously if you're on the interstate outside of Los Angeles, you probably want to get the heck off the roadway no matter what. But if you're lost or trapped, a vehicle is much easier to spot than a pedestrian. If you're lucky enough that there's helicopters looking for you, being near the vehicle is going to drastically reduce the time it takes to find you.