[A-4 Skyhawk]

I've only been here a few months, but today I saw 2 carts traveling together try to make a left had turn FROM THE CART LANE in front of a BIG TRUCK going the same direction as the carts. The truck almost crushed them. Happened in front of Bonifay. Correct me if I'm wrong, but shouldn't the cart move into the car lane and signal a left hand turn before making the left hand turn?? I've seen this happen three time now.