A sign near the track announces, in all seriousness Mach 10.
Ten times the speed of sound or 7,612.07 miles per hour.
So far, very little test time has been lost to bad weather.
A rocket sled does not use wheels.
The test track allows American defence and governmental agencies to perform a variety of high speed tests.
The test track was initially just over a kilometer long when it was laid down in 1949.
The record-breaking sled run of Mach 8.5 on April 2003 was a culminating event in the Hypersonic Upgrade Program.
This system performed its first test in 2012 and continues to be operational.
Sources:Wikipedia/Official Web Site of Holloman Air Force Base
