Why is there a tolling system for NICE road and airport road?

Despite NICE and airport road being Bangalore intracity roads, there is an unusually high toll collection system in place for private and commercial vehicles. Recently Mohandas Pai also raised this [issue](https://www.moneycontrol.com/news/business/no-airport-in-india-has-a-toll-road-before-it-why-this-discrimination-against-bengaluru-asks-mohandas-pai-12888842.html/amp?espv=1). Can anyone provide a logical explanation?