You have a good eye for photography, but it would benefit by stopping the car and taking a little more time. I did some post processing on your second:
Pointing a camera out the window of a moving car is not photography. Photography is something which requires thought and patience if you want to ever take anything better than these kinds of snapshots.
@fokker...thanks for your comments man. I fully agree with your views. I am not a professional like you, actually I took a DSLR Cam first time just a couple of days back and am trying to learn.
I think that you did a great job with the speed shooting. Photography is different for everyone. I have taken some of my best nature shots just out of my window during road trips. Good luck in your venture!