Safety Score Beta
The Safety Score Beta is the first release of the Safety Score which is an assessment of your driving behavior based on five metrics called Safety Factors. These are combined to estimate the likelihood that your driving could result in a future collision. We combine your daily Safety Scores (up to 30 days) to calculate the aggregated Safety Score, displayed on the main ‘Safety Score’ screen of the Tesla app. You can find details around your daily Safety Score by selecting ‘Daily Details’ at the bottom of the screen.
The Safety Score Beta is intended to provide drivers transparency and feedback of their driving behaviors. The Safety Score is a value between 0 and 100, where a higher score indicates safer driving. Most drivers are expected to have a Safety Score of 80 or above.
There are five Safety Factors that impact your Safety Score. These are measured directly by your Tesla vehicle using various sensors on the vehicle and Autopilot software.
Forward Collision Warnings are audible and visual alerts provided to you, the driver, in events where a possible collision due to an object in front of the vehicle is considered likely without your intervention. Events are captured based on the 'medium' Forward Collision Warning sensitivity setting regardless of your user's setting in the vehicle. Forward Collision Warnings are incorporated into the Safety Score formula at a rate per 1,000 kilometers. The value is capped at 63.3 per 1,000 kilometers in the Safety Score formula.
Hard braking is defined as backward acceleration, measured by your Tesla vehicle, in excess of 0.3g. This is the same as a decrease in the vehicle’s speed larger than 6.7 mph, in one second. Hard braking is introduced into the Safety Score formula as the proportion of time (expressed as a percentage) where the vehicle experiences backward acceleration greater than 0.3g relative to the proportion of time where the vehicle experiences backward acceleration greater than 0.1g (2.2 mph in one second). Hard braking while on Autopilot is not factored into the Safety Score formula. The percentage shown in the app is the percentage of manual braking that is done with excessive force when driving and Autopilot is not engaged. The value is capped at 7.4% in the Safety Score formula.
Aggressive turning is defined as left/right acceleration, measured by your Tesla vehicle, in excess of 0.4g. This is the same as an increase in the vehicle’s speed to the left/right larger than 8.9 mph, in one second. Aggressive turning is introduced into the Safety Score formula as the proportion of time (expressed as a percentage) where the vehicle experiences lateral acceleration greater than 0.4g, in either the left or right direction, relative to the proportion of time where the vehicle experiences acceleration greater than 0.2g (4.5 mph in one second), in either the left or right direction. Aggressive turning while on Autopilot is not factored into the Safety Score formula. The percentage shown in the app is the percentage of turning that is done with excessive force when driving and Autopilot is not engaged. The value is capped at 17.1% in the Safety Score formula.
Your Tesla vehicle measures its own speed, the speed of the vehicle in front and the distance between the two vehicles. Based on these measurements, your vehicle calculates the number of seconds you would have to react and stop if the vehicle in front of you came to a sudden stop. This measurement is called “headway.” Unsafe following is the proportion of time where your vehicle’s headway is less than 1.0 seconds relative to the time that your vehicle’s headway is less than 3.0 seconds. Unsafe following is only measured when your vehicle is traveling at least 50 mph and is incorporated into the Safety Score formula as a percentage. Unsafe following while on Autopilot is not factored into the Safety Score formula. The percentage shown in the app is the percentage of unsafe following when driving and Autopilot is not engaged. The value is capped at 60.0% in the Safety Score formula.
The Autopilot system disengages for the remainder of a trip after you, the driver, have received three audio and visual warnings. These warnings occur when your Tesla vehicle has determined that you have removed your hands from the steering wheel and have become inattentive. Forced Autopilot Disengagement is introduced into the Safety Score formula as a 1 or 0 indicator. The value is 1 if the Autopilot system is forcibly disengaged during a trip, and 0 otherwise.
In order to calculate your daily Safety Score, we use the Predicted Collision Frequency (PCF) formula below to predict how many collisions may occur per 1.6 million kilometers driven, based on your driving behaviors measured by your Tesla vehicle. Driving on Autopilot (including 3 seconds after Autopilot is disengaged) will not be factored into the Safety Score formula, but the kilometers driven while on Autopilot are included in the total.
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Predicted Collision Frequency (PCF) = 0.682854 |
x 1.023431Forward Collision Warnings per 1,000 Kilometers |
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x 1.127294Hard Braking |
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x 1.019630Aggressive Turning |
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x 1.001444Unsafe Following Time |
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x 1.317958Forced Autopilot Disengagement |
The current formula was derived based on statistical modeling using 9.6 billion kilometers of fleet data. We expect to make changes to the formula in the future as we gain more customer and data insights.
The PCF is converted into a 0 to 100 Safety Score using the following formula:
Safety Score = 115.382324 - 22.526504 x PCF
Your daily Safety Score is not impacted by the number of kilometers or hours you drive. We combine your daily Safety Scores (up to 30 days) into a mileage-weighted average to calculate the aggregated Safety Score, which is displayed on the main ‘Safety Score’ screen of the Tesla app.
Note: Since vehicles with hardware older than Autopilot computer 2.0 do not measure following distance, Forward Collisions Warnings per 1,000 Kilometers and Unsafe Following Time is replaced by default values of 6.4 and 15.8% in the PCF formula, respectively. For these vehicles, the value of 115.382324 is replaced by 118.773666 in the Safety Score formula.
You can improve your Safety Score by improving each Safety Factor.
Forward Collision Warnings per 1,000 Kilometers
Maintain a safe following distance from the vehicle in front to give you enough time to react to slower or stationary vehicles. Pay attention to the other vehicles on the road and reduce speed in traffic congested areas.
Hard Braking
Engage the brake pedal early when slowing down, coming to a stop or reacting to a change in your environment. Use regenerative braking whenever possible and safe to do so. Maintaining a safe following distance reduces the instances where the brake pedal needs to be applied with extreme force.
Aggressive Turning
When turning, changing lanes or rounding a corner, do so gradually. Reduce your speed heading into a turn, gradually accelerating out of the turn. Do not unnecessarily jerk the steering wheel.
Unsafe Following
Do not tailgate or drive close to the vehicle in front. Maintain a following distance of several car-lengths to the vehicle in front to have sufficient time to react to its speed. Remember that driving at higher speeds in inclement weather or on slick road surfaces requires a greater following distance to allow sufficient time to react safely.
Forced Autopilot Disengagement
Only use the various Autopilot features as described in your Owner’s Manual. Pay attention to the road and maintain your hands on the steering wheel while the Autopilot system is engaged. Autosteer detects your hands by recognizing slight resistance as the steering wheel turns, or from you manually turning the steering wheel very lightly (without enough force to take over steering). Autosteer also qualifies your hands as being detected if you engage a turn signal or use a button or scroll wheel on the steering wheel.