It is the widely held view in the U.S. that distance charging based on vehicle miles traveled (VMT) costs much more than collecting gas taxes, that it involves substantial technology risk, that truckers will kill it, that personal privacy issues raise insurmountable political problems, and therefore, to most politicans VMT equals VWP—villagers with pitchforks. (A law prohibiting VMT was introduced recently in Maryland).
Those assumptions may be wrong. . .