Let's hope that Twitter embraces free speech now that Elon's at the helm. I'm not sure if Trump will even want back on since he has his own site, but we'll see.
The vast majority of roads in the United States are maintained by the state or lower-level agencies. However, some roads are maintained by the federal government. Most of these are minor roads in national parks and national forests https://en.wikipedia.org/wiki/List_of_United_States_federally_maintained_roads
And where do the funds come from for the state and locally maintained roads? A good bulk of the funding comes from the federal gas tax as well as state level gas taxes. Of course, this varies by state.
Overall, state and local governments provided three-quarters of highway and road funding ($155 billion) in 2019. Federal transfers for highways and roads were $48 billion dollars in 2019, or 24 percent of all spending .