The National Map Corps is strictly focused on structures data (point features), because such data can be more efficiently updated and verified by volunteers. Our platform isn't used to update other types of data (line, polygon, etc.).
If you'd like to make any suggested changes to roads data, you'll need to reach out to the Census Bureau, which is where the USGS road data comes from. from ([Census Bureau TIGER Line files][1]). The USGS currently has no system in place to petition for road changes, and I'm not sure that the Census Bureau does either, but you can reach out to them and ask. the [Census Bureau][2] to submit updates.
[1]: https://www.census.gov/geo/maps-data/data/tiger.html
[2]: https://www.census.gov/geo/about/contact.html