Lucas123 writes: Some car makers are delaying the implementation of Apple's CarPlay iPhone interface for vehicle infotainment systems. The delays, which are prompting manufacturers such as Mercedes, Volvo and Honda to push their announcement from 2014 to 2015, appear to be related to a few snags in the integration process or in choosing which model cars should have the middleware. At the same time, many of the automakers rolling out CarPlay are also implementing Android Auto, which will provide a vehicle head unit user interface for Android smartphones. Analysts believe the addition of Android Auto earlier this year may also be adding delays because manufacturers want to be able to announce availability of both platforms in their new model vehicles. According to IHS, adoption of Android Auto is expected to slightly outpace CarPlay with an annual growth rate of 179% compared to 165%. In 2020, for example, 40 million cars will roll off assembly lines with Android Auto versus 37 million with CarPlay.