Tailgating is a very bad habit. 
 Many major & small accidents would 
be prevented if we all kept the legal distance
from the car in front of us. For example: recently i was in 
a serious auto accident an 18-wheeler was following too 
closely to me and hit my car and totalled it.
That wreck scared me majorly & I am healthy today--
I was released from the hospital the same day--
but cases similar too this usually do not turn out as well &
most people are left with physical injuries that last a lifetime.
So please do not tailgate people.
As a survivor, now it scares me personally when i have 
someone tailgating me.  Many accidents could be 
prevented if people were not in such a hurry.