You just keep pretending like "vehicle damage" is the only cost for building and maintaining roads.  I guess I can see why, because your whole argument falls apart if you don't accept that lie.  

Most of the cost of roads and bridges is the initial cost and ongoing maintenance from weather (especially Colorado's freeze/thaw cycles), shifting soils, etc.  Vehicle damage is PART of it, but ONLY part.  Yet you want to completely ignore all the rest.

Of course motor vehicles should pay more for their usage of the roads than bicycles.  Duh.  But that doesn't mean bike riders should get away with paying NO usage-based taxes for roads.  It's patently unfair to have motor vehicles paying for 100% of the usage-based taxes and bikes paying 0%.