Popular briefings swing between “all cars die” and “cars are fine.” The test record is messier. Some vehicles tolerate harsh fields. Some stall, some glitch, some keep running. Age, design, and whether the engine was on all matter, and nobody has published a consumer reliability list you should trust.

The all-or-nothing briefings are popular because they tell you what to buy. The record does not. Vehicles in the same field have stalled, glitched, kept running, or shrugged the test off, depending on age, design, and whether they were on. Nobody has published a consumer list that sorts the driveway into safe and doomed. Treat any list that claims to as entertainment.

What you can plan is optionality. A household that can walk to water, or that keeps one older, simpler vehicle with a full tank, has more choices than a household whose only exit is a software-heavy car in a garage that no longer opens.

You will not get to choose whether the engine is running at the moment that matters, and you cannot see the design from the badge. Older and simpler is a hedge, not a certificate. A plan that needs every modern car to start has a single point of failure and no public test record behind it. Optionality is what you can actually arrange.

Do not start a mass evacuation because the sky did something strange. Roads kill people in the dark faster than a pulse does. Leave if you have a specific, nearer-term reason — fire, flood, a chemical plant — not because a thread told you to.

A garage door is a mundane electronic load. A car that would have run, behind a door that will not, is a car in a box. Know the manual release and try it once while the lights work. A full tank in one simpler vehicle is not a cross-country scheme. It is a local choice you still have. So is being able to walk to water if neither vehicle is the plan.

Dark signals, other drivers acting on the same rumor, and unlit roads are an ordinary way people get hurt. A strange sky is not a destination. Fire, rising water, or a chemical plant with a specific warning are destinations: they have a direction you can name in advance. Leave for those. Stay for a thread. If you leave, leave for the place already written down.