Sounds as though he initially was telling you you were OK to come past, but the rest is odd. 🙂
Remember that "roadies" are not all in the same brotherhood, and a huge percentage currently haven't been doing it all that long and may simply be making random hand gestures they've seen other people make.
The shouts on a club run about cars in my club have got very confusing recently. It used to be that the old chaps shouted "car down" for a car coming towards the group from the opposite direction, and "car up" for a vehicle approaching from behind (remembered as "up your arse and down your throat", obviously not in a gay way). These days you have all sorts of younger chaps enthusiastically reversing that, and shouting with great gusto, so one never knows where the traffic is at all. 🙂