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How long is 138 feet?

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It's about three times as tall as The Hollywood Sign.
In other words, 138 feet is 2.80 times the height of The Hollywood Sign, and the height of The Hollywood Sign is 0.360 times that amount.
(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 49 feet tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about three times as long as a Semitrailer.
In other words, 138 feet is 2.8750 times the length of a Semitrailer, and the length of a Semitrailer is 0.34780 times that amount.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 48 feet (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about one-third as tall as The Great Pyramid of Giza.
In other words, the height of The Great Pyramid of Giza is 3.10 times 138 feet.
(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (estimated original height)
The Great Pyramid of Giza has an estimated original height (without loss due to erosion) of 430 feet. The Pyramid was the tallest structure in the world for almost 4,000 years — from its construction ca. 2551 BCE until it was overtaken by the Lincoln Cathedral in Lincoln, England, built in the year 1300.
It's about three times as tall as a Brachiosaurus.
In other words, 138 feet is 3.20 times the height of a Brachiosaurus, and the height of a Brachiosaurus is 0.310 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 43 feet. 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 one-fourth as tall as The Spring Temple Buddha.
In other words, 138 feet is 0.2750 times the height of The Spring Temple Buddha, and the height of The Spring Temple Buddha is 3.640 times that amount.
(a.k.a. 中原大佛, a.k.a. 鲁山大佛, a.k.a. 魯山大佛) (Fodushan Scenic Area, Lushan County, Henan, China) (including base)
The tallest statue in the world, the Spring Temple Buddha in Henan, China stands at 502 feet tall from its base. The Buddha is located in the 47,300,000-sq. m (11,700-acre) Fodushan Scenic Area near Mount Yao
It's about one-fourth as tall as Blackpool Tower.
In other words, 138 feet is 0.2660 times the height of Blackpool Tower, and the height of Blackpool Tower is 3.760 times that amount.
(Blackpool, Lancashire, England, United Kingdom) (height to peak)
Blackpool Tower, part of an entertainment complex in Blackpool, Lancashire, England, measures 518 feet to its peak. Under ideal conditions, visitors to the highest accessible point of the tower can see as far as the Isle of Man — 315,000 feet to the northwest.
It's about four times as tall as a Telephone Pole.
In other words, 138 feet is 3.80 times the height of a Telephone Pole, and the height of a Telephone Pole is 0.260 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 36 feet 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.