The flyovers on Pantheon Road and Doveton will remain closed for traffic from 10 p.m. to 6 a.m. for 20 days. The Corporation commenced work on restoration of ‘strip seal expansion joints’ of the flyover on Friday. According to a press release from the Chennai Corporation, the traffic police have permitted the work. Motorists using the stretch are requested to make use of the service roads near the structures at night. Traffic will be permitted during the day.