Transport officials and engineers have dismissed for use in Hong Kong the United States-invented scooter billed as the solution to air pollution and traffic jams. The scooter's inventor, Dean Kamen, unveiled the battery-operated device in New York on Monday. It is controlled by sensors and gyroscopes to balance the rider. Mr Kamen said the US$3,000 Segway Human Transporter could be controlled by simple body movements without the need for an engine, gearshift or a steering wheel and could travel at three times normal walking speed. It has a top speed of 19 kilometres per hour. However, Transport Department officials said yesterday the Segway would need to pass a series of tests and gain certification, including emission tests from the Environmental Protection Department, and mechanical and safety checks by its own engineers. The department has not received an application for the Segway to be used in Hong Kong. A department spokesman said it was not clear what driving licence the driver would need to run the vehicle on Hong Kong roads. He said: 'It doesn't even have lights. How is it going to travel at night?' Polytechnic University mechanical engineer Lo Kok-keung said the new invention was designed for large roads and pedestrian-friendly traffic, such as in North America. 'It would be dangerous to drive it on Hong Kong roads because it goes too slowly and the same on pedestrian [footpaths] because it would travel too fast,' he said. Fellow university engineer Chan Sui-ling agreed. 'It might be more useful on the mainland where it could replace bicycles.'