Police said the trailer was carrying the faulty transformer from Kadappa in Andhra Pradesh to a shed in Sriperumpudur for repairs. Around 8 am, when the truck crossed Maduravoyal, the transformer came in contact with the bottom of the grade separator and could not be moved further.
This led to a traffic snarl on the stretch and Maduravoyal police along with traffic police had to make the stretch one way.
And even as people were involved in removing the top portion of the transformer, it suddenly caught fire. Immediately, fire tenders from Koyambedu, Ambattur and Valasaravakkam rushed to the spot and brought the fire under control.
The vehicle was removed from the flyover around 12 noon after which regular traffic resumed.
When contacted, Koyambedu traffic police said the driver has been detained and a case will be registered after receiving a complaint from the Highways department.