Defining Thresholds for Your Fleet

Identifying the data you want to track is a pivotal step in creating and maintaining a fleet safety program that works for your fleet. Measure what matters to you and your fleet by configuring thresholds on your devices. Sounds simple enough, right? But wait! You have a range of vehicles, so uniform thresholds cannot be applied to the entire fleet. Did this just get complicated? Not for you!

We are here to help!

The following thresholds can be applied to PNP-3000 devices by utilizing the PNP Configuration Page in the Portal:

  • Rapid acceleration
  • Harsh braking
  • Hard left/right turning
  • Idling
  • Speeding

How are Thresholds Measured?

Definition:G-force, (“G” as in gravitational) is not really a force; it is a felt weight based on acceleration or deceleration. Acceleration is the increase in rate of velocity/speed; deceleration is the decrease of rate of velocity/speed. The measurement involves location, speed, and time.

Here are some real-world g-force examples:

  • Decent rollercoasters reach between 3-6g.
  • Top fuel dragsters reach an average of 4g.
  • Formula One cars during extreme braking maneuvers reach 5g.
  • A high performance sports car jamming 0-60 in 2.5 seconds, only reaches 1.5g.
  • DOT defines harsh (not dangerous) braking as .45g (Think of your average NYC cab driver).
  • >25g means probable death or serious injury.

Pro and Enterprise Only: Still unsure about what g-force is? See the How Do I Detect A Crash? article.

Recommended G-Force Thresholds

We’ve done the research for you and here are some recommended default thresholds (in g-force) based on types of vehicles by weight class*:

Weight Class Recommended Thresholds
Class 1



6,000 lbs or less
Harsh Braking 0.3833g

Rapid Acceleration 0.3733g

Hard Turning Events 0.375g
Class 2



6,001 – 10,000 lbs
Harsh Braking 0.36g

Rapid Acceleration 0.35g

Hard Turning Events 0.35g
Class 3



10,001 – 14,000 lbs
Harsh Braking 0.3367g

Rapid Acceleration 0.3267g

Hard Turning Events 0.325g
Class 4



14,001 – 16,000 lbs
Harsh Braking 0.3134g

Rapid Acceleration 0.3034g

Hard Turning Events 0.3g
Class 5



16,001 – 19,500 lbs
Harsh Braking 0.2901g

Rapid Acceleration 0.2801g

Hard Turning Events 0.275g

*The above threshold settings are estimates and should be used as a starting point. You’ll need to adjust these settings to gather data that really works for your fleet. In addition, please note that the thresholds for a truck at empty or full cargo status (i.e., a delivery truck at the beginning of the day and at the end of the day) may significantly differ and it’s important to understand which violations you want to catch.