a Space Cushion
When traveling in
congested traffic there can be frequent stops and starts.
The vehicle infront of you may suddenly stop or swerve around
an obstacle. It is important to give yourself enough distance
to avoid a collision if this happens. Another name for this
is a space cushion (not a space pillow - right). A space
cushion gives you more time to percieve, stop or avoid a
The proper space
cushon depends on the speed you are traveling and the driving
conditions. At a minimum, you should use a 2 second space
cushon for good driving conditions and moderate speeds.
This is called the "2 second rule".