Many people believe that nonmotorized modes (walking, cycling, and their variations) have an inferior right to use public roads compared with motor vehicles. This reflects the belief that motor vehicles are more important to society than nonmotorized modes, and that roads are funded by motorists.
Here is a study that investigates these assumptions. It finds that nonmotorized modes have the legal right to use public roads, that nonmotorized modes provide significant transportation benefits, and pedestrians and cyclists pay a significant share of roadway costs. Although motorist user fees (fuel taxes and vehicle registration fees) fund most highway expenses, funding for local roads (the roads pedestrians and cyclists use most) originates mainly from general taxes. Since bicycling and walking impose lower roadway costs than motorized modes, people who rely primarily on nonmotorized modes tend to overpay their fair
share of roadway costs and subsidize motorists.
I highly recommend this as rational for alternative transportation design and planning.