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- Check the media volume, the alert follows it, not the ringer.
- If Bluetooth is connected, the tone goes to the car speakers. Check the car's source and volume.
- The alert plays even when the phone is on silent.
Trepni needs the "Always" permission so the alert can also arrive when the screen is off and the app is in the background. Without it, alerts work only while the app is open on screen.
In Drive the GPS runs at full accuracy, otherwise the alert would come late. On a long trip keep the phone on a charger, and if your phone has aggressive battery saving, allow Trepni to run in the background.
Three common reasons: you reached five reports in an hour, you already have an active report of the same kind within 300 m, or you are not signed in. The app tells you which one.
If a call from SOS does not start, dial the number by hand. On a device without a phone, such as a tablet, calls are not possible, but the numbers and your location stay on screen.
Frequently asked questions
Is Trepni legal?
Trepni shows camera locations from public project documents and what drivers report from the road. It is not a radar detector and not an official police service. Reports are about the road, not people.
Where does the data come from?
Two sources: camera locations from public project documents and driver reports (speed cameras, crashes, hazards and traffic checks), which other drivers confirm or switch off.
Do I need an account?
Not for driving, alerts or SOS. You only need an account to report or to confirm someone else's report. Sign in with Apple, Google or email.
Does it work offline?
Yes. Speed cameras and reports within 15 km are cached on the phone and alerts keep working. A banner shows when the data was last refreshed.
Does it drain the battery?
In Drive the GPS runs at full accuracy, because without it the alert would come late. Outside Drive, Trepni does not track your location. On a long trip, keep the phone on a charger.
How early is the alert?
At least 10 seconds ahead, whatever your speed: the first alert comes at the larger of your setting and the distance you cover in 10 seconds. For a speed camera, short steps follow at 200, 100, 50 and 30 m; for a report, one alert.
Can I report a traffic check?
Yes, as a general point on the road that expires on its own within 2 h at most. Alcohol and drug checkpoints, photos and descriptions of officers or vehicles are not allowed and are removed.
When are CarPlay and Android Auto coming?
No date yet. They are marked SOON until they ship.
Is there a light theme?
Yes: Auto, Light and Dark. Drive is always dark, unless you turn on "Daylight in drive mode", for glare in open sun.
How do I learn the app?
On first use a short guide points out the buttons on Road and in Drive. You can replay it from Profile, under About, "How it works".
What can I report?
A speed camera, a crash, a traffic check as a general point, and a road hazard in twelve kinds: rockfall, object, animal, stopped car, traffic light, pothole, road closed, traffic jam, roadworks, ice, water on road, bad weather.
How long does a report last?
A traffic check starts at 45 min, a crash at 60 min, a hazard at 60 min to 8 h depending on its kind; each confirmation keeps a report at least 30 min more. At most: a check 2 h, a crash 3 h, a hazard 12 h, a pothole 7 to 30 days, a mobile radar report 3 h. Three "Gone" votes remove a report sooner.
What is SOS, and does it work without signal?
A button on the Road screen and in Drive: emergency numbers (112, 122, 124, 123, 19807), your location to share and short advice after a crash. It works without signal; calls go through your phone.
How often does the data refresh?
On the Road screen and Map every 2 minutes and as soon as you return to the app, and in Drive every 2 minutes, even in the background. In Profile you choose 2, 5 or 15 min, or off.
- Phone model and system version.
- App version (Profile, then About, it is at the bottom).
- What you were doing when it broke and what you expected.