Mentor uses g-force levels to determine harsh or risky driving. G-force is a measure of acceleration. Mentor’s “Harsh Braking” and “Harsh Cornering” thresholds are based on industry best practice and eDriving’s own field testing. These are subject to change in light of experience, industry standards and in-house research.
Mentor’s current “Harsh Braking” threshold is set at 0.41 g, or 9 mph/s. A driver reducing speed from 60 mph to 33 mph within 3 seconds means they decelerated 27mph in 3 seconds, which equates to decelerating an average of 9mph/second. This would trigger a “Harsh Braking” event in Mentor.
Mentor’s current “Harsh Cornering” calculations use g-force levels to determine whether a driver is traveling at an unsafe speed and velocity while making a turn. The “Harsh Cornering” threshold is set at 0.5 g. The larger the turning radius, the higher the speed tolerance. For example: A driver making a turn at >20 mph at a two-lane intersection with a 55 foot/17 meter turning radius would cause a “Harsh Cornering” event to be recorded. At a three-lane intersection with an 82 foot/25 meter turning radius, “Harsh Cornering” would be triggered at a turning speed of >25 mph.