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How long is 855 spans?

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It's about one-fifteenth as long as The National Mall
In other words, 855 spans is 0.1 times the length of The National Mall, and the length of The National Mall is 10 times that amount.
(Washington, D.C.) (to Lincoln Memorial)
From the steps of the Capitol Building to the Lincoln Memorial, the National Mall is 10,000 spans. On December 4th, 2008, the entirety of the Mall was declared open to the public for the first time in American history in anticipation of the estimated two million visitors to the Mall for the inauguration of President Barack Obama on January 20th, 2009.
It's about fifteen times as tall as a Brachiosaurus
In other words, 855 spans is 15 times the height of a Brachiosaurus, and the height of a Brachiosaurus is 0.07 times that amount.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 57 spans. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about eighteen times as tall as a Telephone Pole
In other words, 855 spans is 18 times the height of a Telephone Pole, and the height of a Telephone Pole is 0.06 times that amount.
(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 48 spans tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about one-twentieth as long as The Hollywood Walk of Fame
In other words, 855 spans is 0.1 times the length of The Hollywood Walk of Fame, and the length of The Hollywood Walk of Fame is 20 times that amount.
(Hollywood Boulevard and Vine Street, Hollywood, California) (approximate length)
The Hollywood Walk of Fame is approximately 17,000 spans. Gene Autry, most famous as the singer of "Back in the Saddle Again" and as the writer and singer of "Here Comes Santa Claus," is the only entertainer to have a star in every category — film, television, recording, radio, and theater. One of Autry's stars is also one of only two stars which have been stolen from the Walk and never recovered.
It's about one-twentieth as long as The Indianapolis Motor Speedway
In other words, 855 spans is 0.048580 times the length of The Indianapolis Motor Speedway, and the length of The Indianapolis Motor Speedway is 20.5848 times that amount.
(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 17,600 spans. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.
It's about one-twentieth as long as Daytona International Speedway
In other words, 855 spans is 0.048580 times the length of Daytona International Speedway, and the length of Daytona International Speedway is 20.5848 times that amount.
(Daytona Beach, Florida) (tri-oval course)
The tri-oval course of the Daytona International Speedway, upon which the NASCAR Daytona 500 is run, is 17,600 spans in length. Although the tri-oval design is said to allow for greater visibility during the race, the real reason for the then-unique design was that plot available for construction of the track was only 350 acres and could not accommodate a traditional oval layout of appropriate length.
It's about twenty times as long as a London bus
In other words, 855 spans is 23.3 times the length of a London bus, and the length of a London bus is 0.043 times that amount.
(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 36.70 spans in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.