Technically, I think what you see when you navigate to maps.google.com from Safari on the iPhone is a mobile optimized version of Google Maps. So, you don't get the full interface that you see on the desktop browser. As such, I wasn't expecting that any option for send would even be available. Since it does appear though, I'm hoping that there is some way to get to the section I am interested in.
After you navigate to maps.google.com on your iPhone, do a search. Once your searchresults appear on the map, tap one of them. I've noticed that the map can be a little "touchy". Sometimes I need to tap the result more than once in order to get the first pop-up. In that pop-up will be details about the search result including the name, address, phone, "Write a review", "more info", etc links. One of the links at the bottom of the pop-up window is "Send". Once you tap that, the new window appears where you can choose where to send. This window is the one I can't scroll far enough to the left on to get to "Car". Interestingly, if you rotate from portrait to landscape, you get pretty close. You basically get a view of the whole "Send" pop-up window - except for the key area at the left where you choose between Email, Phone, Car and GPS. You have to be able to choose the appropriate category in order to get the proper fields in the Send window in order to transmit the map data to the appropriate device type. So, like I said, I can almost get there, but not quite.
Jeff