Tuk-Tuks were invented in Thailand over 50 years ago, evolving as a motorized relative of the rickshaw. The Tuk-Tuk was given its name from the rather rough sound of the early models. The single stroke motor powering the first three-wheelers had a distinctive hum when operating, and the "tuk-tuk-tuk-tuk-tuk" sound became a familiar sound to many in need of quick and convenient transportation in Bangkok. The Tuk-Tuk has improved its technology and quality over the years, while emerging as one of Thailand's most recognizable and identifiable symbols.