LeGGGeNNdA, check out JernejL's SA:MP map editor, it's awesome for mapping such stuff. You can delete objects too!(Don't without young's permission). It's windows based Map editor, might be difficult at first but it's cool. Now I know why people around samp map so well, it's because of it! Download it and use it, it's cool. Will be useful for your drift maps.

I hope I was there at server to join this; but, you know right? :/