No collision in certain places on my tracks

[PiMoNFeeD]

The title says it. I'm trying to convert GTR2 tracks to rFactor and I can say that it's going well, but for some reason some places don't have collision so you fall through them OR you can just float on them like if there's no gravity at all :/. For example, in some places GTR2 tracks use more than one ROAD material (B1ROAD, B2ROAD, LGROAD and just basic ROAD for example), they're all pretty identical in 3dsimed but the only material with collisions is basic ROAD, so because they're all identical I just mapped all this road materials to the ROAD one and it works (so there's no B1ROAD, B2ROAD, LGROAD and etc now), but now turns out that I have the same problem not only with the ROAD materials and I dont know what to do :/
UPD: so I guess I need to create the .tdf file but how and does it exist in GTR2?
UPD2: solved, .tdf file in GTR2 is specialfx.tec in GameData\Locations

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