Years and years ago, I read an ad (IIRC in the Wittenberg Door's "truth is stranger than fiction" section) for a rapture "safety device" that you could install on your car's drivetrain/steering system.
In case of rapture, the device would (somehow) slow down and gently steer your now-unmanned car to the side of the road and out of traffic, the idea being that if you're concerned about your loved ones being "left behind" in the still-moving vehicle, buying and installing the device would ease your conscience (for failing to convert them in time, presumably).
I don't recall whether it also shifted the transmission into park/neutral, engaged the emergency brake and shut off the ignition, but I would hope so. Otherwise, poor old heathen Aunt Martha would die from collision with a cow, instead of collision with that other Christian's car - you know, the one whose owner unconscionably failed to purchase and install a safety device on his car beforehand.
There are several improvements that could be made, such as tuning the radio to a predetermined foreknown Christian station, and "Four Spiritual Laws" pamphlets that pop out of the ashtrays.