Help????? traffic school question

Question

To avoid rear-end collision, the following distance under ideal conditions should be ____ seconds.

a.2

b.3

c.4

d.5

Answer 1

c.4

Answer 2

B

Answer 3

For me it is 5 seconds, what is this to avoid rear-end collision. This is not only the factor to considered in this kind of manner. There is more than meets the eye.

1. THE USE OF COMMON SENSE

2. THE USE OF OUR BASIC INSTINCT

Answer 4

I was taught 3 seconds.

Answer 5

Many of us were taught to use the car-length rule for following distance (one car length for every ten mph). That rule is no longer recommended because car lengths are difficult to visualize, impossible to visualize when moving, and the rule didn't provide enough space in the first place. For example, 6 car lengths at 60 mph provide roughly 108 feet of space. At 60 mph, the average alert reaction time eats 60 to 130 feet (and in the real world, closer to 135 feet for many), leaving little or no time to act. Two seconds of following distance at 60 mph, on the other hand, gives you over 176 feet of pavement to react and respond. Even at two seconds of following distance, you must respond quickly, but it can be done under normal circumstances.

How do you apply the two-second rule? Watch as the vehicle ahead passes some object—I often use shadows or marks on the road surface—then count "one-thousand-one, one thousand two." If you pass that same spot before getting to "two," you're too close—back off!

There ARE times when two seconds isn't enough. Leave more space when you can, and leave additional space if following a vehicle with different characteristics than yours—motorcycles or trucks, for example—or if the road surface is slippery. Motorcycles can often stop faster than you, and trucks (or trailers) impede your vision, which can cause you not to see hazards until too late. Ice can increase your stopping distance many times over, so leave lots of extra space if it might be present. Eight or ten seconds is not unreasonable around ice.