I know a guy who had a safe driving distance feature on his car. It would keep a safe driving distance between his car and the car ahead of him on the freeways. He had to turn that feature off because cars kept cutting in front of him because THEY COULD!
And? Why do that? This is something that most drivers never seem to get. Which is that it does not matter how many cars cut in front of you it will not alter how long it takes you to get to your destination!
Example
You live at A and wish to drive to your work at B
The distance between A and B is 50 miles.
If you drive at 50 miles per hour then it will take you 1 hour to get from A to B
So it does not matter how many cars cut in front of you, as long as your speed is still 50 miles per hour it will still take you 1 hour to get from A to B
Now every car that cuts in front of you is driving quicker than you are, so in this example they would be driving quicker than 50 miles per hour. So they would get to their destination quicker than normal.
However you are still driving at 50 miles per hour so will STILL take 1 hour to get from A to B
Now at this point you might say "Ah yes but I do not always drive at a constant speed of 50 miles per hour". To which I reply "Ah yes but if you work out your average speed and therefore work out how long on average it takes you to get from A to B it still would not matter how many cars cut in front of you".
The only way that a car cutting in front of you would cause you to get from A to B longer than normal would be if somehow you REVERSED. That is true when you are stood in a queue and someone cuts in front, this causes you to essentially go backwards. Though this is not true when driving as you are moving and do not tend to stop the car, put it in reverse and drive backwards a car length or few.
Now repeat this back to me and I will make sure you understand!