How many seconds do you stay behind a car for safety in texas?

I have to take my permit test and my Texas driver's handbook states that you should stay two seconds behind other cars...but in another drivers ed book I have, it says that your supposed to stay three seconds behind another car. Does anyone know which one is correct?


Thanks in advance|||The answer you are looking for is known as the "Two Second Rule". You need a minimum of 2 seconds during regular daylight hours, 4 seconds at night, and more during bad weather. . . . As for the headlights it is usually 300 ft as you overtake a car ahead of you and 500 ft as you approach an oncoming car. It is simpler though to always dim your lights when you can see the headlights coming at you.|||You stay a reasonable distance behind the car in front of you always. Also, you always dim your lights at night when you are blinding them with bright lights.|||My understanding is 1 car length for each 10 mph . Headlight dimming is 500 ft .|||2 seconds is the general rule. 3 seconds is safer. As a motor-coach driver, company policy is a 6 second following distance.