India, Feb. 10 -- A sea of vehicles, stretching up to 300 kilometers, transformed roads leading to the Maha Kumbh Mela in Uttar Pradesh's Prayagraj into parking lots, with lakhs of pilgrims eager to attend the world's largest religious gathering finding themselves stranded in their cars on Sunday, hundreds of kilometers away from the fair site.

The unprecedented congestion, which netizens called the "world's biggest traffic jam," reportedly extended up to 200-300 km involving vehicles of pilgrims headed for Maha Kumbh mela via Madhya Pradesh and prompted the police there to stop traffic in different districts on Sunday, leaving people stuck on roads for several hours.

A day earlier, hundreds of vehicles heading for Prayagraj were stoppe...