What it means
An RLVD system needs two inputs: the signal state for each approach, and the position of each vehicle relative to the stop line. The signal state can come from a wired connection to the signal controller or from video analysis of the signal head. A wired input is more reliable. The evidence usually includes an image before the line, an image after it, the plate, the signal phase and the time into red.
How it applies in India
Indian junctions add free left turns, two-wheelers that stop beyond the stop line, faded markings and signals that switch to flashing amber at night. Each of these needs a rule in the system, or it produces false violations. Rule 167A of the Central Motor Vehicles Rules lists jumping a red light among the offences that camera footage with an electronic stamp of location, date and time can support. RLVD is usually one subsystem of a city ITMS, alongside speed and lane enforcement.