The phrase "test track" refers to a specially designed area where vehicles are tested for performance, safety, and other important factors before they are sold or used on regular roads. Full definition
At board meetings, on test tracks, and in design studios, decisions are being made today that will influence what you drive tomorrow. (automobilemag.com)
Mutual Funds: The last five years have provided a rigorous test track for mutual funds. (aaii.com)
There are only a handful of test tracks at which you might sustain that speed, and they are closed to the public. (automobilemag.com)