being able to open your car without keys or the push of a remote button. Instead, the car automatically unlocks when you walk up to it. The latest advances in automobiles are making this a reality, according to Siemens. Engineers have created individually programmed key fobs which contain sensors so that the car knows when its driver is approaching the car and when he or she is inside. Even if the fob remains inside your coat or purse, the sensors transmit the signal -- unlocking the door. Once inside, all the driver has to do is hit the break, press a button and he's off and driving. That means you won't have to fumble for keys outside in the cold or rain. It is also safer than the traditional key -- while there are a thousand different ways to cut a mechanical key, the fob system involves about four billion codes that are continuously changing. That means even if a thief intercepts your code, they won't be able to enter because the vehicle has already changed codes since the last time you entered it. If you're sharing your car with others, the system is personalized for each driver. That means each individual driver's personal settings -- from their steering wheel height, to the radio and even the climate control -- will change according to how the driver likes it, according to Siemens.