Yes, as bicycles/pedestrians are not as tall as trucks, the underpasses can be lower with all resulting benefits. So yes, the bikes probably should go under the

Yes, as bicycles/pedestrians are not as tall as trucks, the underpasses can be lower with all resulting benefits. So yes, the bikes probably should go under the cars. Doesn't mean however, that the cars couldn't go over a raised bridge. Or even just split the difference. Have the underpass go down like 1.5m and then raise the road above that.