Safety is most important, there is a lot of moving and jumping in and out.
Usually using MP5K's, Drivers use the sling assisted style, with your support arm locked out - creating good control through your frame.
Other guys normally have theirs condition 3 - empty chamber, loaded magazine in place with the selector already on semi-auto, just rack it back and getting going (so you don't go up to full-auto by accident), sling S-folded and rubber banded to the buttstock, so you can grab it and put it on easily.
High-speed offensive and defensive driving tactics cover quite a bit, including ramming into stuff - always fun!
Vehicle assaults are totally different, always trying to get in on blind spots and using a lot of distraction devices - snipers play a key role in stopping the vehicle via taking out the tyres, engine block or driver (normally passengers too in a sniper ambush incase they can still operate that vehicle).
There are lots of drills and practices, especially for VIP protection and the likes.
Car stops, vehicle checkpoints - I won't go into.
CQB-TEAM Education and Motivation.
"Pragmatism over theory."
"Anyone with a weapon is just as deadly as the next person."
"Unopposed CQB is always a success, if you wanted you could moonwalk into the room holding a Pepsi."