1. Staying with the pack
The classic rule of thumb that the government uses for setting speed limits is that the posted speed should be around the 85th percentile of natural traffic speed. It's often lower than that, though, because a lot of areas go with preset speeds. That means most of the cars are speeding. Translation: if you’re not keeping up with the flow of traffic, you’re presenting a greater risk by going slow.
2. Driving in the right lane
If you’re in bumper-to-bumper traffic, sure, you can be in the left lane, but otherwise, the left lane is for passing only. Not only is staying in the left lane a great way to spark road rage in those around you, but in many states you can get a ticket for obstruction of traffic for staying in the left. Bravo to the officer above for enforcing the rule.