The ELD does tons of stuff. It tracks location, speed, doors, shifting (to teach better strategies to the driver), logs, fuel levels, and anything the engine c

The ELD does tons of stuff. It tracks location, speed, doors, shifting (to teach better strategies to the driver), logs, fuel levels, and anything the engine can spit out thru that jbus (like obd-ii which some do use). We used to upsell tracking things and having parts on hand at the correct depots for fixing things before they became an issue on the side of the road. HoS is just one part of what those things do. But even the simplest of them usually hook into the data bus at some point to detect 'drive'. You can buy ones that are just apps and do only HoS. But not sure if those are considered legal anymore (been a few years since I messed with it). When you have 1 truck HoS is a big part of why you want them. When you have a fleet of 2000+ trucks your metrics are different in what costs more.