It isn't so simple. As a manager, it is easy to incentivize "deliver as many packages as you can" (e.g., pay per package). It is not so easy to incentivize "d

It isn't so simple. As a manager, it is easy to incentivize "deliver as many packages as you can" (e.g., pay per package). It is not so easy to incentivize "deliver 83%[=1/1.2] as many packages as you can." Furthermore, people always optimize what can be measured, and measuring safe driving, on a day-to-day basis, is harder than measuring number of deliveries (not impossible, maybe, but much harder---also less transparent, easier to game, more intrusive).