If you happen to do a whole lot of traveling and yet don’t want to be left at the mercies of local cabbies, surely car rental services are a must in your life. Well, the Zipcar app caters to this group of people, where you’re faced with a bunch of green dots on the map to show where the car rental places are (within San Francisco). Touch any one of them and you’ll be brought to a new page, showing you the types of cars that are available for rent, how many butts can fit within as well as the cost. If you want to reserve that ride, just set the time you’ll be collecting it for use. Once you’re arrived at the said location, tap the horn for the vehicle to actually sound it’s horn so that you can locate it, while touching the unlock button will actually unlock the car for that added geek touch.