In the movies, cops are usually portrayed as bumbling, fumbling dumbasses. This is because,most of the time, there can only be one hero in a movie. If the cops, military or boy scouts were competent, there would be no need for Bruce Willis, Christian Bale or Denzel Washington.
But, in real life, most cops are pretty smart. Not that they're dealing with a lot of Bill Gates' out there. Still, the officer in this video had to think quick or he would be dead now.
Watch as a semi-truck goes out of control and towards this officer in this video posted by d at LiveLeak. (That's the person LiveLeak username...d.)