Acting Traffic Police chief Maj-General Jirasan Kaewsaeng-ek said people who planned to drive to Sanam Luang to deliver food and drinks should use the Bang Lamphu and Phra Arthit roads and drive under Pinklao Bridge before parking at Thammasat University before 7am.
After 7am, all roads around Sanam Luang will be closed to traffic, he said.
He said people could find out more about the traffic instructions by calling 1197 or visiting http://www.trafficpolice.go.th.