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Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks.
Sound is the perceptual result of mechanical vibrations traveling through a medium such as air or water. Through the mechanisms of compression and rarefaction, sound waves travel through the air, bounce off the pinna and concha of the exterior ear, and enter the ear canal.
The Road Transport Department (Malay: Jabatan Pengangkutan Jalan, abbreviated JPJ; Jawi: جابتن ڤڠڠكوتن جالن ), is a government department under the Malaysian Ministry of Transport. This department is responsible for registration of vehicles in Malaysia and issuing driving licence & vehicle number plates.
The Malaysian Public Works Department (Malay: Jabatan Kerja Raya Malaysia (JKR); Jawi: جابتن كرجا راي مليسيا ) is the federal government department in Malaysia under Ministry of Works Malaysia (MOW) which is responsible for construction and maintenance of public infrastructure in West Malaysia and Labuan.