If this is May 2015, this is prior to the system in question (HW2 or AP2) even existing in prototypical forms. The previous system (HW1 or AP1) is a MobileEye

If this is May 2015, this is prior to the system in question (HW2 or AP2) even existing in prototypical forms. The previous system (HW1 or AP1) is a MobileEye chip, which is found in most other cars that also have "lane keeping" features. They all use the same chip with the same model provided by MobileEye, and can choose to overlay features on top of it or augment the system with other sensors (such as radar on the Model S/X). For that system, it is essentially the same performance whether it's a $150k Tesla or $30k Honda.