The data in the paper gives number of fatal crashes per person miles driven segregated by sex and age.
Thus, based on the number of miles a person travel in a motor vehicle per year, and the sex and age of the driver, the probability of a fatal crash for one year can be worked out.
That probability is the converted to a lambda value which replaces the lambda value for motor vehicle mortality. The new lambda value is -LN(1-Driving Distance*Expected Number of Fatal Crash Per Mile)