Yeah? Are you sure of that? What makes you think that bicyclists in general are motorists?
Roads, for the most part are financed with gasoline and diesel fuel taxes. I didn't know that bicyclists bought those fuels. In some instances, cities kick in additional funds by local referendum, usually supported by property taxes or even an add-on to the sales tax for special projects. There you got me - that sales tax for special projects. And then there are toll roads that are financed by the tolls collected. But in general, bicyclists do NOT pay the taxes that are used to build the bike lanes. And the costs to build them are WAY disproportionate to the number of users they serve compared to roadways used by automobiles.
Do you seriously believe that even devoted cyclists don’t EVER drive???
Get real.