Dhaka based taxi service in the city, whereas few local companies operate motor-bike service. The Cabinet of Bangladesh has approved the draft of a guideline legalizing smartphone application-based ride-hailing services such as Uber and Pathao. Shahjalal International Airport , located north of Dhaka city centre is the largest and busiest international airport in the country. The airport has an area of . The airport has a capacity of handling 15 million passengers annually, and is predicted by the Civil Aviation Authority, Bangladesh to be enough until 2026. In 2014, it handled 6.1 million passengers, and 248,000 tonnes of cargo. Average aircraft
Acoustic hailing device Acoustic hailing device An acoustic hailing device (AHD) is a specialized loudspeaker that emits high-power sound waves for communicating at a distance. AHDs vary in design, output, and usability. Acoustic hailing devices are acoustic devices capable of outputting highly intelligible sound at very high volumes. The distance at which acoustic hailing can be effective varies based on several factors including the sound level, directionality, and frequency of the acoustic source, the sensitivity and directionality of the receiver, and the transmission channel environment. The sound level diminishes or attenuates with distance. Consequently, as a general rule, higher source levels have greater