This depends on your speed. From a legalistic standpoint, there is no set distance; that's not to say you wouldn't get pulled over for tailgating. In general, you should keep enough distance between you and the vehicle in front of you so that if they were to suddenly slam on the brakes, you wouldn't hit them.
550 feet.
A minimum of 2 seconds in good weather.
Everybody gets lost while driving once in a while.
100 feet.
You should dim your headlights when approaching another vehicle at least 500 feet away. This helps to prevent blinding the other driver and ensures safer driving conditions for both parties. If you're behind another vehicle, you should also dim your lights when you're within 300 feet.
It is traveling at about 58.66 feet per second.
Yes there are laws regarding texting while driving in many states.
2
Square feet are used to measure area, while feet are used to measure distance. They are not equivalent, and so cannot be converted from one to another.
Many accidents are the result of reckless driving or driving while intoxicated.
400 ft
72 Feet