About half of Roadfood.com readers thought hot dogs make the best street eats.  Pretzels and falafel also come from carts, ice cream sometimes.  Pizza?  Not a cart food, but often sold from storefront pizzerias by the slice, for eating and walking.  Other choices suggested by Forum posters: grilled meat on a stick, roasted nuts, gyros, Italian ices, tacos, corn dogs, yakisoba, clams on the half-shell, poutine, French fries, sausages on a roll, and corn-on-the-cob!