This moth was found lying on the road in Bengaluru, India. Although it was damaged very badly from the under side, the wing pattern was still intact. Is it still possible to identify it? It is 9cms from head to wing tip
This is a hawkmoth, Sphingidae. One of the largest and arguably most beautiful of all moths. I am not familiar enough to India to pinpoint the species, it might be a member of the genus Agrius or Manduca.
Here's a picture of a resembling, species from the Manduca genus.