Making a vertical ramp in director mode

[Spyderborg]

So I found out that props placed in director mode aren't registered by AIs, which means fun with drivers on a high speed freeway. I would like to make a sloping ramp that escalates to nearly 90 degrees to send these drivers into space, but apparently props have to obey physics and I can't just stack a bunch of regular ramps together. Is there any way to do this?