Firstly, I'm assuming that the Model 3 will have the same style key as the Model S and X. Considering that our current car has hand-crank windows, it is safe to say that we will take a giant technological leap forward in many ways when we get our Model 3! I'm fairly certain that the below situations have been worked out as this style of key is far from new. I would love to hear how the below are non-issues and for what reason. I am open to any tips on how best to manage safety and security around a car with proxy keys. Situations like: I'm showing someone the car; they are in the driver's seat and I'm in the passenger seat. If the mechanical key is in my pocket and I'm sitting next to them, they can't do any harm. With a proxy key in my pocket, they can essentially drive away, potentially inadvertently. Same situation as above, but my child is playing in the driver's seat and I'm in the passenger seat with the key in my pocket. We are going on a road trip and my wife packs our spare key in a bag inside the car. With a mechanical key, someone would have to know where it is, find it and fire the ignition to drive away. With a proxy key, anyone can drive away with the car, potentially inadvertently. I'm putting the winter tires on and I have the key in my pocket. With a mechanical key, I know that if I have the only keys to the vehicle in my pocket, the car can't be started. With a proxy key in my pocket, the car can be opened. I leave the keys in the car with my spouse while I run in to grab something. With a mechanical key, it would be a difficult 'accident' for someone to put the key in the ignition and turn it. With a proxy key, I suppose someone would have to depress the brake pedal AND flip the lever into drive to get it to go. Our car keys are in the house. With mechanical keys, one would have to break into our house to get the car keys to gain access to the car. With a proxy key, if they are in the house but JUST close enough so the car will unlock if someone walks up to it, can they gain access to the car? I have heard that keeping the fobs in a metal container will prevent this, but I'm not sure that will be practical (keys find their way to funny places in our house). I have locked my car and walk away. I forget something near my car so I walk back and grab it and walk away again. Is there a way for the car to unlock because I'm close to the car with the fob in my pocket, but no re-lock as I walk away again? Are there any other situations that you noticed when you first started using a proxy key that made you think? What was your solution to that? Thanks for your input!