The name tuk-tuk stems from the rather rough sound of the early models. The single stroke motor powering of the first three-wheelers had a distinctive hum when the engine ran, and this "tuk-tuk-tuk" became a familiar sound to many in need of quick and convenient transportation around bangkok. Since its first appearance on bangkok'city streets, the tuk-tuk' technology has improved dramatically. Its small size makes it suitable for driving down alleys.