It's about one-one-thousandth as long as I-80
In other words, 4 kilometers is 0.000862435 times the length of I-80, and the length of I-80 is 1,159.510 times that amount.(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 4,638.03 km. A 60 km stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about one-one-thousand-five-hundredth as long as The Great Wall of China (wall only)
In other words, 4 kilometers is 0.0006391 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 1,565 times that amount.(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 6,259 km. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-one-thousand-five-hundredth as long as The Amazon River
In other words, 4 kilometers is 0.0006214 times the length of The Amazon River, and the length of The Amazon River is 1,609 times that amount.(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 6,437 km. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about 1,500 times as tall as a Christmas Tree (artificial)
In other words, the height of a Christmas Tree (artificial) is 0.00059 times 4 kilometers.(artificial; average height)
The most common height of an artificial Christmas Tree is 0.0023 kilometers. According to the most recent USDA Census of Agriculture, a total of 1,389.59 sq. km (343,374 acres) of Christmas Trees were farmed in the US in 2007.
To all those observing, Merry Christmas from The Measure of Things!
It's about 2,000 times as tall as André the Giant
In other words, 4 kilometers is 1,800 times the height of André the Giant, and the height of André the Giant is 0.00056 times that amount.(Andr( Ren( Ruossimoff) (1946-1993) (wrestler and actor; WWE kayfabe height)
Andr& the Giant, who had a pituitary syndrome called acromegaly, was 0.0022 kilometers tall. Prior to 1973, Roussimoff was billed as having a height of 0.0021 kilometers and his true height is the subject of some dispute.
It's about 2,000 times as tall as Shaq
In other words, 4 kilometers is 1,800 times the height of Shaq, and the height of Shaq is 0.00056 times that amount.(Shaquille O'Neal) (1972-) (professional basketball player, most famously of the Los Angeles Lakers)
Shaq is 0.0022 kilometers tall. Shaq maintains an active interest in police work and has served as a reserve officer in both Los Angeles, California and Miami, Florida while playing for NBA franchises in those cities.
It's about 2,000 times as long as a Queen Size Bed
In other words, 4 kilometers is 1,969 times the length of a Queen Size Bed, and the length of a Queen Size Bed is 0.0005079 times that amount.(North American/Australian standard; length; mattress only)
A Queen-Size mattress measures 0.002032 kilometers from head to foot. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m (49 sq. ft) for those in positions of wealth or power.