You would also want to monitor the rear trailer overhang and make sure that this does not hit the ground. I would think the number of trailer axles is important to model since you could have a situation where one axle may support the entire trailer and the other two would be in the air. You may see the front of trailer hit the tractor frame or the top/rear of the tractor frame hit the bottom of the trailer but the limits should be seen. Max deflection between tractor and trailer should come to light when you draft this up. It may take a few people and be quite greasy but you should be able to see how the 5th wheel pins in all directions. You should be able to measure the deflection on a fith wheel without a trailer attached. A low boy will probably have a fully oscillationg 5th wheel to allow for more side to side deflection as well. Different 5th wheels, different 5th wheel locations and heights, tractor trailer sizes and king pin locations should have an affect on this. I would think the model would need to be pretty specific for the tractor trailer combos used. Select the vehicle that is closest to the one you're modeling. Open the vehicle window (the truck button on the toolbar). "I'm not sure how to model the gooseneck pivot and the other 3-5 axles or even if it's necessary" Civil 3D 2022 Posted JNote: I have an old version, so the buttons and commands I describe may not match what you see. I would really try to get one of the software packages to help with this but in the event of that not happening. Civil 3D zawiera specjalnie zaprojektowane narzdzia dla najwaniejszych dziedzin inynierii ldowej. We use Autotrack for sweep paths through projects but I have not used the vertical path routines. I have only had to estimate vertical clearance for a couple of jobs and I have done it with profiles.
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