Well, I was playing Korengal Valley (the big one, dunno if there is a small one
) for the first time, and I dunno if its already known by the devs but..I spawned (as insurgent, at a spawnpoint very very near from the USA Main Base) and there was one of those breacheable gates and I could see a bike near it.
I pressed 'E' (just for testing), and voi la, I was driving the bike.
(i passed through this closed gate) Thats it
Best regards,
lock.