Buses and Fire Trucks
With an average "life expectancy" of 12 to 15 years, buses from the Metropolitan Transit Authority (MTA) in New York City end their duty by being sold and recycled for scrap metal. Before being sliced into smaller pieces with hydraulic cutters, you might find yards of buses awaiting the crusher [source: MTA].
School buses face a similar fate nationwide although some are sold and reused for personal transport, motor home conversion and even housing. Many municipalities have yards for holding out-of-commission city or state vehicles, so it's less likely to find buses in public junkyards except in smaller or more rural areas. Some salvage dealers post available buses for sale online if you're in the market and don't happen upon one at a local yard.
Other supersized vehicles destined for the scrap yard include fire trucks. Though many are auctioned to collectors or stay on the grounds of a firehouse after retiring, some find their way to salvage yards where they're sold off in parts or scrapped.