If a tree literally fell on your car, there was no way you were going to accelerate out from under it. Humans simply don't have the reaction time to do so. No

If a tree literally fell on your car, there was no way you were going to accelerate out from under it. Humans simply don't have the reaction time to do so. Now, if that tree fell in front of you, the slower you're going, the more likely you are able to stop before running into it. Human reaction time to apply brakes is ~half a second. Stopping distance is roughly linear as speed increases. So, 20mph you start braking in ~15 feet. 40mph, 30 feet. 60mph 45 feet. Etc. That's just to react - you still need the time/space to bring the vehicle to a stop or slow enough to swerve around the tree.