Road
Admittedly not the most enjoyable film on this list, Road makes it based largely on its name: the recall value is too high, and a film of that name does spring to mind when thinking of road films -- even though not enough people know what it was about.
Antara Mali and Vivek Oberoi do well as eloping lovers, and Manoj Bajpai's hitchhiker is suitably creepy -- though it's the underrated soundtrack to this one that's the real performer.
Also See: Jodies we would love to see