The Phnom Penh City Hall issued an order prohibiting all types of oil tanker trucks from driving on streets in the capital in daytime during the forthcoming 21st ASEAN Summit and related meetings later this month, according to an announcement on Friday. \"The ban is to maintain public order and safety and to avoid traffic congestion and any incident during the 21st ASEAN Summit and related meetings,\" the City Hall\'s announcement said. \"All oil tankers can be driven in Phnom Penh only between midnight and 05:00 a.m. in the morning from Nov. 13 to 23.\" The City Hall also ordered the municipal police, military police and local authorities to strengthen the order effectively. Cambodia will host the 21st ASEAN Summit and related Summits from Nov. 15 to 20 at the Peace Palace in Phnom Penh, the capital of Cambodia. Prime Minister Hun Sen appealed on Thursday to residents in Phnom Penh to keep dignity and maintain public order in order to together lead the forthcoming Summits successfully. He said that all schools and universities along roads, which will be traveled by delegates during the Summits, will be closed from Nov. 16 to 21. ASEAN groups Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Vietnam.