It's about 55 times as tall as The Hollywood Sign
In other words, 30 shackles is 55 times the height of The Hollywood Sign, and the height of The Hollywood Sign is 0.02 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 0.550 shackles tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about 55 times as long as a Semitrailer
In other words, 30 shackles is 56.25 times the length of a Semitrailer, and the length of a Semitrailer is 0.0178 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(DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 0.53330 shackles (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about 65 times as tall as a Brachiosaurus
In other words, 30 shackles is 63 times the height of a Brachiosaurus, and the height of a Brachiosaurus is 0.02 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 0.470 shackles. 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 75 times as tall as a Telephone Pole
In other words, 30 shackles is 75 times the height of a Telephone Pole, and the height of a Telephone Pole is 0.01 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 0.40 shackles 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 100 times as long as a London bus
In other words, 30 shackles is 98.2 times the length of a London bus, and the length of a London bus is 0.010 times that amount.(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 0.3050 shackles 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.
It's about 150 times as tall as a Giraffe
It's about 200 times as long as a Beetle (Volkswagen)
In other words, 30 shackles is 201.8 times the length of a Beetle (Volkswagen), and the length of a Beetle (Volkswagen) is 0.00496 times that amount.(1964 model) (a.k.a. Volkswagen 1200, a.k.a. Käfer)
A 1964 Volkswagen Beetle measures 0.14870 shackles. As the longest continuously-produced automobile design — in production for 75 years between 1938 and 2003 — the Beetle was voted the most fourth-most influential car of the twentieth century by the Global Automotive Elections Foundation.