Can I use a moped in a city?

I just moved to a pretty rural area of japan a few weeks ago and i'm planning to get a gentsuki (moped) liscence to travel around a bit easier. I was wondering if anyone knows anything about riding a moped in cities?

I know you cant use the expressway, but what about the roads in cities, say if I had to travel through a city to get somewhere, or I was going to see a friend who lived in a city. Is it okay/legal to ride a gentsuki on city roads?

Thanks!!