SINGAPORE - Thousands of diners were reminded to return their trays on Monday (June 21) when dining in was allowed to resume. Most diners at two hawker centres were also seen doing so on their own. Senior Minister of State for Sustainability and the Environment Amy Khor said officers of the National Environment Agency (NEA) had advised 4,500 diners to return their trays on Monday. When The Straits Times (ST) visited North Bridge Road Market and Food Centre at about 9.45am on Tuesday, more than 10 people were seen returning their trays and used cutlery. It is mandatory for diners to return their trays and clear their table of litter from June 1, but no enforcement action will be taken until Aug 31, as part of an effort to help diners adjust, the NEA had said on May 14. But dining out was not allowed until Monday, after Singapore introduced phase two (heightened alert) measures on May 16. The Covid-19 pandemic has underscored the need to maintain high public hygiene and cleanliness standards. Despite years of extensive educational efforts to change the behaviour and mindsets of diners in public places, some diners were still seen not returning their trays when ST visited two hawker c...