Booth-less toll fee collection at Tamil Nadu’s Paranur: how does the multi-lane free flow system work?

<iframe
  src="https://hindustansphere.com/embed/cluster/165408bed0d2359b6e1cad8edaa8fb732cc72d3e"
  width="100%" height="320"
  style="border:0;max-width:680px"
  loading="lazy"
  title="Booth-less toll fee collection at Tamil Nadu’s Paranur: how does the multi-lane free flow system work?"></iframe>