Vehicles on circular route ignoring enemy?

[syrion 10]

I have many patrols going in various routes around my mission. They tend to loop around large portions of road. If something else has caused the detection of the players, they will join in the fight--but the cars themselves will almost never open fire.

The APC actually seems to try to run over me, and when it failed to kill me it did fire a shot. The insurgents' technicals, though, completely ignored me. I stood in the middle of the road in front of them, and none of them did anything. When one almost hit me, I simply stepped out of the way--and its gunner did not shoot at me.

What gives? They're on "aware" and "open fire." The waypoints are "moves" with a "cycle" at the end.