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This was a millitary airport, I think they built a polygon in 1992 known as Mobikrog, 2016 they renewed the race track and upgraded it to meet all race track standards , now known as AMD Gaj. Have you ever heared about it?

Za vec informacij : http://siol.net/avtomoto/novice/anderlic-o-prvem-slovenskem-dirkaliscu-smo-v-fazi-pozitivnega-zacetka-428025

I knew that they are talking for years about the racing track, but I didn't know that exist.

I knew they talked about it, and thought it was closed for a long time, but website is saying othervise