The Noida expressway will remain closed for 30 minutes -- from 15 minutes before the demolition blast to 15 minutes after -- as the Supertech twin towers are brought down later this afternoon, senior traffic police officer Ganesh Saha told NDTV. "The arrangements have been made, and our plan has been put in motion. We are proceeding as per the plan. We have earmarked parking areas for mediapersons and residents of the nearby area. Traffic near the towers is being diverted since 7 am" he said.