I am using AGV to move vehicles thru an assembly system. I have different size bodies that are being put on the AGV. The parts will be different sizes (ex: 14', 16', 18', 20'). The line is designed for 14' but I need to run 20' down the same line. But the spacing is such that the 20' is too long and it should delate the AGV behind it from entering that space. I want the parts on the AGV's to interfere with each other and stop the AGV from moving, thus it will decrease my thruput because of the parts interfering. But my model does seem to do that. Is it possible? or is there a setting I'm missing?