While gridlocks do bring down average driving speeds in big cities, reckless driving when not in gridlocks is far too common. My own house is in a residential area, and yet, I hear drivers constantly honking while zipping by. Moreover, it does not take much speed to run over somebody.
The road accidents figure likely includes pedestrians, and in the least it includes people in tuk tuk/rickshaws, scooters, mopeds, motorcycles, etc. these aren’t roads with a high frequency of cars hitting cars at high speeds.
Most of this is probably due to gridlock, it’s hard for Indian traffic to reach speeds sufficiently fast to cause terminal injury.