title: Counting Cars in OpenCV + Python
body: <p>ive got this big/easy problem that i need to solve but i cant..
  What im trying to do is to count cars on a highway, and i actually can detect the moving cars and put bounding boxes on them... but when i try to count them, i simply cant. I tried making a variable  (nCars) and increment everytime the program creates a bounding box, but that seems to increment to many times.. 
  The question is: Whats the best way to count moving cars/objects?</p>
  
  <p>PS: I Dont know if this is a silly question but im going nutts.... Thanks for everything (:
  And im new here but i know this website for some time (: Its great!</p>