What it means
The camera learns or is configured with the permitted direction for each lane. A vehicle tracked moving the other way for a set distance triggers an alert with an image and a short clip. The tracking distance matters. Too short, and vehicles reversing or turning cause false alarms. Too long, and the alert comes late.
How it applies in India
Wrong-way driving is common on Indian highways near breaks in the median, at service road joins and near villages, often by two-wheelers and tractors taking a short cut. NHAI's ATMS standards list wrong lane or direction driving among the 14 incidents that VIDES cameras identify. Rule 167A lists driving against the authorised flow of traffic among offences that camera footage can support. On high-speed roads, the alert is also a safety warning for oncoming drivers through variable message signs.