For anyone wanting to fix flying cars and are too impatient for a fix, create a local copy and edit the scene.xml included in the local mod you have created (i used notepad). Under the 4 seperate boundary sections located throughout the file, change the value of "vertex pos" by about 100 (eg. <vertex pos="-789.90002 -18.3"/> is edited to <vertex pos="-889.90002 -18.3"/>) You may have to relaunch the game after saving your changes.