Here is a great illustration on why it is important to control the front of the house. Note how early on the cars/trucks seem set up for a mulitiple steal, but some nice work by the buses changes that, and some really nice controlled sweeping beginning at around 0:45 allows the final bus to remove the front truck (which didn't quite execute a proper freeze) and score 2, even though the officials are called in for a measurement immediately afterwards...

https://www.youtube.com/watch?v=HfDZixZFzms