I'm purely guessing here. But roads are owned by different government agencies: federal, state, county, municipal, HOAs, and private. And those different agenci

I'm purely guessing here. But roads are owned by different government agencies: federal, state, county, municipal, HOAs, and private. And those different agencies might have different ideas on how they want funding. If you drive primarily on town streets, which you pay for through property taxes, your odometer won't know to charge you less. This is based purely on my experience on trying to add bike lanes in my city. It was fairly easy to get it done on our sidestreets, the city owns those, but major streets are federal or state owned and will take years due to bureaucracy.