hey Charan,
I have the demo and yes I can see those headlights on the roads, but I don't yet have the full game so I don't know, have you tried just putting up the general graphics, as this is part of the x-plane world and may be included if you put the graphics higher.
One other thing though, how long is the time limit on the x-plane demo, and is it possible to reset the timer on the demo.
Thanks, Dom