I think the roadside bombs are triggered by someone with line-of-sight. If you're close enough to detect it you're close enough for it to kill you.
We already have insugent incendiary devices (which I assume you meant), the problem as in any urban warfare is who to point em at. How do you tell the difference between insugents waving weapons around and locals waving weapons around, until they start shooting? Work that one out and you'd earn yourself a medal or something.