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.
Everybody gets lost while driving once in a while.
A minimum of 2 seconds in good weather.
100 feet.
Yes there are laws regarding texting while driving in many states.
2
Many accidents are the result of reckless driving or driving while intoxicated.
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.
It is traveling at about 58.66 feet per second.
400 ft
No one should use cell phones while driving. Cell phone use while driving has been shown to cause as many accidents as drunk driving, even when hands-free devices are used. Texting while driving is even worse.
72 Feet