It's about one-two-hundredth as long as The English Channel.
In other words, 0.50 kilometers is 0.00467 times the length of The English Channel, and the length of The English Channel is 214 times that amount.(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 180 km to 34 km, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about 200 times as tall as a Christmas Tree (artificial).
In other words, 0.50 kilometers is 220 times the height of a Christmas Tree (artificial), and the height of a Christmas Tree (artificial) is 0.0045 times that amount.(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 250 times as tall as André the Giant.
In other words, the height of André the Giant is 0.0043 times 0.50 kilometers.(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 250 times as tall as Shaq.
In other words, the height of Shaq is 0.0043 times 0.50 kilometers.(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 one-two-hundred-fiftieth as long as The 405.
In other words, 0.50 kilometers is 0.0042904 times the length of The 405, and the length of The 405 is 233.08 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 116.541 km. 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 one-two-hundred-fiftieth as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 240 times 0.50 kilometers.(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 km (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 250 times as long as a Queen Size Bed.
In other words, 0.50 kilometers is 246.10 times the length of a Queen Size Bed, and the length of a Queen Size Bed is 0.004063 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.