The move is primarily aimed at making such vehicles safe for women.
The road transport ministry has reiterated the deadline amid reports that most of the states had not done much to meet the target.
All taxis, buses and public transport vehicles, except three-wheelers and e-rickshaws, will have to install GPS and an alert button.These devices will be placed by the manufacturer, dealer or the operators.
The alert button will alert both the transport department and police control rooms to take quick action, as and when pressed by the passenger, and the GPS will help in tracking public transport vehicles.
(With ANI inputs)