High Security Registration Plates were introduced to solve a real problem, ordinary number plates were easy to fake or tamper with, which made it hard for police and transport authorities to reliably identify vehicles involved in crime, tax evasion, or accidents.
To fix this, the Ministry of Road Transport and Highways used its rule-making power to amend the Central Motor Vehicles Rules, building in tamper-resistant, laser-branded plates with a unique identification number as the new standard. Rather than trying to force an overnight nationwide swap of every vehicle already on the road, the government chose a forward-looking cut-off, every vehicle manufactured from a fixed date onward would need to come pre-fitted with an HSRP from the factory or dealership itself.
That fixed date was 1 April 2019. From this point, new vehicle registrations across the country began carrying the high-security plate as a default feature rather than an optional retrofit, giving the scheme a clean, traceable starting line. Older vehicles were folded into retrofitting drives only in later years, once the new-vehicle pipeline was already compliant, which is why any year after 2019 in this list describes enforcement expansion rather than the actual starting point, and 2018 falls just before the rule took hold.
Locating the actual notified starting point of the mandate points squarely to one year.
\[ \boxed{\text{2019}} \]