The New York City Subway began installing its public address/customer information screens, commonly known as "countdown clocks", in its stations in 2007. In 2012, the system began offering SubTime, a website and iPhone app for real-time train arrival estimates for several of its subway services, and the arrival data are shared with outside software developers to support creation of additional apps. There are also PIDS installed on some MTA Regional Bus Operations routes over the years, but mostly, the MTA offers real-time bus tracking through another website/app called MTA Bus Time.