Automatic Number Plate Recognition
Also called: ANPR · Topic: Infrastructure: Transport, Communications and Energy · NCERT: Beyond NCERT
Meaning
Automatic Number Plate Recognition (ANPR) is a camera-based technology that reads a vehicle's number plate on its own, with no person needed. The camera takes a picture of the plate, and software turns it into text: the Vehicle Registration Number (VRN). The system then matches that number against records, such as the national vehicle registration database or a toll account. It matters because it lets authorities identify vehicles and enforce rules like toll payment, traffic fines and security checks without stopping traffic. Its weak points are misread plates, which can lead to wrong charges, and privacy, because it collects images of every passing vehicle.
Example
Multi-Lane Free Flow (MLFF) tolling on Indian national highways has no boom barrier, so vehicles drive through without stopping. Gantries over the road read the FASTag by radio and read the number plate with ANPR cameras. If the toll is not paid, the owner traced through the plate gets a digital demand notice (an e-Notice). Unpaid notices bring a higher fee and can get the FASTag blacklisted.
Don't confuse with
- FASTag: a sticker (an RFID tag) on the windscreen that a reader detects by radio waves. ANPR does not need a tag. It reads the plate itself, so it can catch vehicles whose tag is missing or not working.
- GNSS-based tolling: uses satellites to track the distance a vehicle travels and charges for that distance. ANPR only identifies a vehicle at the fixed point where a camera stands.