Samsara calculates the safety score using a mix of harsh events, speeding events, and AI-detected unsafe driving behavior events over time. The safety score surfaces throughout the dashboard, such as in the Safety Overview and in the Driver Coaching Workflow, to encourage positive driving behaviors and to coach drivers to reduce unsafe driving practices and minimize the likelihood of accidents.
To help you quickly and easily identify safety score severity, the Samsara dashboard displays safety scores with the following default color-coded indicators to represent the range of the safety score performance:
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To configure the safety score performance band ranges for your fleet, see Configure Performance Band Ranges.
Each event is assigned a Safety Score weight based on the severity of the offense. To customize the safety score weights to highlight the behaviors that matter to you the most, see Safety Score Weights and Configuration.
Samsara automatically calculates the safety score for drivers and vehicles. When viewing multiple drivers or vehicles, such as in the Safety Overview, the system aggregates total behavior data. The following are key considerations for understanding when you manually calculate safety scores:
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Distance Unit: Use miles as the unit of measurement for calculations, regardless of region.
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No Distance Logged: Drivers who have not logged any driving distance will have a safety score of 0. Only drivers with recorded driving distances display a safety score.
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Score Range: Each driver has a score that can range from 0 to 100, with 100 being the maximum potential safety score.
You can calculate the safety score of each driver or vehicle using the following equations:
Safety Score = 100 - (sum of all score impacts)
Where the sum of all score impacts is the total impact on the safety score for all unsafe driving behaviors. This depends on the type of behavior as follows:
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Speeding behaviors
Impact to score =
(Time spent speeding x weight) / (total time driving / 100) -
Following Distance, Inattentive Driving (Automatic):
Impact to score =
(Number of events x weight) / total time driving -
All Other Behaviors:
Impact to score =
(Number of events x weight) / (total miles driven / 1000) -
Positive Behaviors (such as Defensive Driving):
Positive behaviors are negative values. Subtract these from the total score impact to reward safe driving.
For a clear overview of how specific behaviors affect the safety score, refer to the Safety Risk Factor Reports. These reports display the impact of each behavior on the safety score:
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Negative Behaviors: Displayed as negative values, indicating a reduction in the safety score.
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Positive Behaviors (such as Defensive Driving): Displayed as positive values, indicating an improvement in the safety score.
Samsara utilizes color-coded performance bands to visually represent the safety scores that display in reports and for coaching activities.
To modify the performance range that displays for each color:
Samsara recommends that you inform your drivers that certain data collected about their driving will be used to calculate a Safety Score and recommends that you provide drivers with materials about the Safety Score configuration and calculation specific to your organization. Safety Scores should be used primarily for coaching and training purposes and to help build a safety culture within your organization. Employment decisions including, but not limited to, those involving hiring, termination, compensation, and route and hours assignments should never be based on Safety Scores alone and should always only be one data point for an employment decision that is ultimately made by a supervisor or other employee.
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