Nissan's latest innovation takes the lowly car horn and elevates it to the status of "smart." The 2013 Altima has a new feature that's likely to surprise buyers. It's called Easy-Fill Tire Alert. The car's tire pressure monitoring system informs drivers when a tire is low on air and then uses the sedan's horn and hazard lights to confirm that the tire has been filled adequately.
This is a classic use of the Task Unification Technique, one of five in the innovation method called SIT. Task Unification works by taking a component and assigning it an additional job. That component can be an internal resource (in this case, something on or in the car) or an external resource, something in the vicinity of the car, but not within the manufacturer's control (a passenger, for example). The additional job can be "stolen" from another component or it can be assigned something new.