need help with a bridge!

hello!
as the title says i have some problems with a bridge! its something i don´t get in the definition! everything works just 1 thing bothers me, once you enter the bridge the car goes beneath the tarmac! i was not able to solve that problem! if some of you would be so gentle to have a look on it! thx
<a href="http://www.4shared.com/rar/Kpke3VXq/PTM-Show-Event-Test1.html" target=_blank>PTM-Show-Event-Test1.rar</a>

Is your bridge normal tile or LevelTile?

example:

TileDefinition bridge_left_part-pat.png bridge.png
Tile 1101 0 0 36 90 0 0 72 180
End

TileDefinition bridge_right_part-pat.png bridge.png
Tile 1103 0 0 36 90 0 0 72 180
End

TileDefinition bridge_middle_part-pat.png bridge.png
Tile 1105 0 0 64 90 0 0 128 180
End


TileGroup 1201 3
LevelTile 2 1105 50 0 0
A 1101 2 0 0
A 1103 98 0 0
End

its a LevelTile! and its made out of 1 tile, no left or right side! do i need to make 3 parts? but i guess it should work like this as well!?

its a LevelTile! and its made out of 1 tile, no left or right side! do i need to make 3 parts? but i guess it should work like this as well!?

should work