From Zendrive's FAQ page[1]:
> How does it work?
> Zendrive measures driver safety using only phone sensors. Integrate the Zendrive SDK into your driver app, and we’ll measure your drivers’ Caution, Control, and Focus while on the road, as well as detect collisions. This is done by measuring a wide variety of safety factors, like speeding, hard brakes, sharp accelerations, phone use, swerving, length of time driving, time of day, and many many more.
> Who’s it for? How are people using this?
> We built Zendrive for any On Demand company with a growing fleet, to help them manage their growth. With in-depth analysis showing any particular driver’s safety, or fleet-wide safety, it gives fleet managers the tools they need to improve their fleet’s driving to ensure safety, reduce risk and liability, and increase savings.
> Since launch we’ve found additional types of companies getting value from Zendrive, from fleet management platform companies, to activity tracking companies and expense tracking companies who use the driving detection in the technology, to hardware companies looking for new safety features.