Yes, seat belts are required here. Click it or ticket--it's a $118 fine.
As for street food, I give you:
Food Carts Portland
This phenomenon in Portland is influencing the rest of the state. While there has always been street food present at our Saturday farmer's market, suddenly there are a lot more people interested in 1) eating it, and 2) selling it. There are more food booths at market now than ever, and some vendors are even expanding to Wednesday night market. That's exciting, as it gives us cheap dinner options in the middle of the week (yum, Oscar's Burritos). Additionally, we had a guy with a hot dog cart set up shop downtown a few months ago, and some business students have set up a cart in front of the business building on campus to sell healthy lunches.