From the National Ghost Track Bureau....similar to hurricanes, tornadoes, and earth-quakes, a rating system has been developed for ghost track progression...the GTP system.
Any operating race track has a GTP rating of ZERO "0"
Any former track covered/TOTALLY ELIMINATED by, but not limited to, shopping center/mall, housing development, high school football field, forest, cemetery, forest, lake, highway, etc. etc. etc. has a GTP rating of FIVE "5".
Fractional gradations are also used, for example: a race track that operated in the past year, but has no present promoter, or apparent season has a .5 GTP. Tracks that have been in a similar state of existence for five or more years, are a "1".
updated by @bobby-williamson: 12/05/16 04:08:38PM