Though it’s the biggest and most comprehensive transportation system we have, Miamians have a love/hate relationship with our city buses. The vehicles are clean and air-conditioned but they travel along congested routes and can run on unreliable schedules. The frequency of service varies by route, time and day of the week: as often as every 10 or 15 minutes or as far apart as every 45 minutes. A one-way bus fare starts at $2.25 and children less than 42 inches tall travel free. Different buses and routes can fluctuate by 25 cents or so, but nothing will cost you more than $3.