What it means
HSRPs use a standard font and layout. That helps character recognition, because the system sees the same character shapes every time. But an ANPR camera on an Indian road will also see older plates, non-standard fonts, two-line plates and hand-painted characters for years to come, so an ANPR system must read both.
How it applies in India
The Ministry of Road Transport and Highways amended the Central Motor Vehicles Rules, 1989 so that all vehicles manufactured on or after 1 April 2019 are supplied with HSRPs, including the third registration mark, by the vehicle manufacturer to the dealer, who affixes them. PIB's release of 6 December 2018 says dealers can also provide HSRPs for older vehicles, and that HSRP helps trace lost or stolen vehicles. Rule 167A lists contravention of rules on registration plates among the offences that camera footage can support. Enforcement agencies can use ANPR to flag vehicles without a compliant plate.