Cự Ly 38

Cự Ly 38 helps you monitor the estimated distance to the vehicle ahead using your iPhone camera, GPS speed and voice alerts in Vietnamese or English. KEY FEATURES • Detect cars, lorries and buses within the forward viewing area. • Estimate distance using the rear camera and display speed from GPS. • Compare the estimated distance with reference thresholds for speeds from 60 to 120 km/h. • Display colour-coded status indicators and play voice alerts when the estimated distance falls below the reference threshold. • Calibrate distance estimates and adjust the viewing area to suit your phone's position. • Process vehicle detection on your device, with no model download needed during use. • Enable rear-seat reminders to check for children or pets. • Choose Vietnamese or English and customise alert settings. DISTANCE REFERENCE The app uses the distance table in Article 11 of Vietnam's Circular No. 38/2024/TT-BGTVT, intended for dry, level, straight roads with good visibility. The app does not extrapolate alert thresholds for speeds outside the table's range. PRIVACY The camera is used to detect vehicles and estimate distance. Location access is used to obtain GPS speed while you use the app. The app does not save images or location data, or send them to a server. USAGE NOTES Mount your iPhone securely with the rear camera facing forwards. Only set up and calibrate the app while parked. Do not look at or interact with your phone while driving. Displayed distances are estimates and can be affected by vehicle size, lighting, camera angle and phone placement. Cự Ly 38 provides information for reference and does not replace the driver's observation, judgement or an advanced driver assistance system (ADAS). Monitoring and alerts work while the app is open in the foreground. Locking the screen or switching to another app stops monitoring. Using the camera, GPS and keeping the screen on may increase battery consumption and device temperature.