RFID - presence and car

[otto001]

Hi,

while planning my house re-design I am also thinking about RFID.
I think some kind of presence-recognition and car-approaching sensor could be implemented using RFID.

My thoughts:
If I place some RFID-tags in the house shoes, I could check if someone is at home (no house shoes at usual place --> someone at home).
And if I had some chips in the car, the door of the carhouse could open when I drive through the driveway.
As RFID is a completely new technology for me:
How could this be implemented? Which kind of tags and readers could be used?

Thanks and regards,

Otto