Our military does a great job at keeping drivers alive. They have tactics and techniques I won't talk about as someone could die from me telling.
Everything does happen real fast over there and there are usually alot of civilians around when it goes down. If a convoy stops they kill all they can and then the convoy is looted right down to the last nut and bolt.
The IEDs are put down in ways you never expect till someone gets blown up. They put them in dead dogs or in a fresh rock pile near construction or in yesterdays hole from an IED
As for scouting ahead thes guys have no arms seen untill they attack.