Why not have lead vehicles remotely operated from the following convoy or vehicle sweep the road with the detection equipment we have.There is no reason to not be able to detect these IEDs before a manned vehicle in the convoy is targeted.
How many convoys have you been on?
Do you have any idea how many patrols and convoys are operating at any givne time?
All they would have to do, is delay detonation for a couple of minutes or so.