Server rack vs Traffic light: size comparison
Server rack: 1.87 m. Traffic light: 3 m. Both silhouettes are drawn at the same scale.
Size ratio: ×1.6
Server rack
1.87 m
What is measured Usable height of a 42U server rack
One "U" is exactly 44.45 mm, or 1.75 inches.
Source : Wikipedia — 19-inch rack
Traffic light
3 m
What is measured Height of a road traffic light
The first electric traffic light was installed in Cleveland in 1914.
Source : Wikipedia — Traffic light