Taxi medallion to "The Washington Post", medallions were "the best investment in America", but—due to increased competition from app-based car services and transportation network company growth from companies like Uber and Lyft—taxi medallions are now decreasing in price. In 2013, the price of a medallion was $625,000. In 2014, that price had risen to around $700,000. In 2014, a medallion was worth nearly $700,000. The total value of all medallions and assets related to them had a value of $2.5 billion in Chicago in 2013. In 2012, medallion prices ranged from $87,000 to $385,000. In 2015, Chicago's average medallion price was under
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