Enhance maintenance and inspection of vehicle (Piloting maintenance and emission inspections of vehicles). Transport. Ministry of Public. Works and. Transport. (MPWT). Cambodia Climate Change Strategic Plan 2014-2023,. NSDP 2019-2023,. Rectangular Strategy,. National Policy on Green Growth and sectoral development plans. 20 or 30 vehicle inspection centers will be in operation by 2030. 1 million vehicles are expected to be inspected by 2030. Reduce maintenance cost/saving cost.