Real collisions. Every second, in video and data.
Pick a collision. Press play to watch the road camera, with the vehicle's speed and g-force from the device's sensors moving in step. Every file is downloadable below.
Eight seconds at 100 samples a second
Around every detected impact the device keeps the full-rate accelerometer and gyroscope: 4 s before, 4 s after. This is what that looks like for this collision.
From the crash_pulse record
- Samples
- Window
- −4.0 s → +4.0 s
- Rate
- 100 Hz
- Peak
- Pulse shape
- Δv across the impact
- Units
- m/s² · rad/s · s from video start
Δv is the change in speed caused by the impact itself, integrated from these samples over the few tens of milliseconds of the impact. It measures severity, not vehicle speed.
Velocity, matched to video
Doppler, once a second
The GNSS chip measures speed from the Doppler shift of the satellite signals and reports it about once a second. It smooths the value over a few seconds, so after a sudden stop it trails reality by roughly 1–2 s.
Latest GNSS fix, every 0.1 s
The latest GNSS fix, sampled every 0.1 s and logged as soon as it arrives. It updates about once a second. It shows a change a little sooner than the GNSS speed record, and is the one to match against video frames.
From the crash pulse
Four layers, one clock
The route JSON is one array of time-stamped records.
crash_pulseFull-rate accelerometer (gravity removed) and gyroscope around the impact, plus gravity and the Δv analysis: impact severity for claims triage, injury assessment and fraud checks.
gnss_imuPosition (in these samples, metres from where the video starts), speed and heading anchored to each GNSS fix and carried forward between fixes, accelerometer with gravity, gyroscope and a 3×3 orientation matrix for every sample: ego-motion aligned to the video.
gpsGNSS fixes: position and altitude (in these samples, metres from where the video starts), course and speed, for trip records, mapping and usage-based insurance. Current firmware adds decimal speed with its accuracy, and a video-sync record.
accel · gyroA reduced summary set of accelerometer and gyroscope samples, for harsh braking, cornering and acceleration scoring. For continuous data use the layers above.
Take the whole sample
Tell us the crashes your safety case depends on.
Request Data