It's about one-thirtieth as long as The 405
In other words, 3,900 meters is 0.033465 times the length of The 405, and the length of The 405 is 29.8820 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 116,540 meters. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about thirty times as tall as The Great Pyramid of Giza
In other words, the height of The Great Pyramid of Giza is 0.033 times 3,900 meters.(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 130 m (280 cubits). 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 one-thirtieth as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 30 times 3,900 meters.(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 120,000 meters (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about forty times as long as a Football field
In other words, 3,900 meters is 35.54240 times the length of a Football field, and the length of a Football field is 0.0281354 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 109.7280 meters from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 9.1440 meters farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about forty times as long as a Football (Soccer) Pitch
In other words, 3,900 meters is 37.10 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 0.027 times that amount.(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 90m and 120m (when the Laws were originally, they used imperial measurements of 105 meters, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about 40 times as tall as Big Ben
In other words, 3,900 meters is 41 times the height of Big Ben, and the height of Big Ben is 0.024 times that amount.(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
The clock tower of the Palace of Westminster, which houses the bell known as "Big Ben," rises 96.0 m. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about 40 times as tall as The Statue of Liberty
In other words, 3,900 meters is 41.940 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 0.02384 times that amount.(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (pedestal base to torch peak)
The Statue of Liberty reaches 92.99 m including the pedestal. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.