There have been suggestions before on the stagecoach or letting a wagon carry more people, but how about this:
select wood bench, right click wagon, install. Repeat with up to 4 benches. The top disapears and you have a people mover. Driver, 2 to each of the 4 benches and 1 riding on the tail, giving transport to 10 total.
We have an alt addiction in this game. Let's finally get some love to people transport over land