A car driver is driving his car at the usual speed and the car overturned and the passenger died.

Question: A car driver, with a passenger riding with him, is driving his car at the usual speed on a non-asphalted road. On the route he is travelling, there is a ridge (ʿurm) between the tracks of the two wheels, and the car was jolted by that ridge and overturned, and the passenger died. Is the driver required to perform kaffārah for killing, given that he was driving at the customary speed for people of cars in such a place and with that type of car – indeed, even less than that?