The iBeacon stays in your vehicle, so the app only tracks the trips you take in it (just don’t forget your phone!). As a bonus, this reduces your phone’s battery usage.
Motion tracking available in most phones is different. The app will activate whenever you’re moving fast – that can include carpooling, using public transportation, and even fast scooters or bikes. It’s because it doesn’t know whether you’re driving your car for work, or carpooling with friends.