Some cab businesses are diversifying and marketing specialty services to nuanced markets, such as trips to and from non-emergency medical appointments or providing fixed-route, bus-type service. Others cater to disabled passengers. Vehicle manufacturers are helping out on that front too, including Toyota, which announced last month that it’s improving its taxi model that loads passengers in wheelchairs into the vehicle. The improvements will cut boarding time to about three or four minutes, for a two-thirds time savings, making it more attractive for taxi drivers to delve into this niche market.