I originally bought 3 packages, hoping it would be more than adequate to cover my son's room (9x11ft) with two windows, a door, and a double-door closet. The product is made decently enough, although some of the road edges would not exactly line up. It took longer to apply than most wall decals, due to the fact it required lining up the roads. I spent close to 2 hours. It was difficult to create the designs I wanted because there are a lot of curved pieces and not enough straight ones. I would have gladly bought 2-3 more packages just of straight roads. Also, the curved pieces are tight curves, so if you try to put them together without flat roads in between, they make a tiny circle, which is also not the look I was going for.
In order to have the design be less cluttered, I did not use most of the road signs and I used none of the intersection pieces or dead end pieces. I wanted all the roads to end at the ceiling or a door or window.
I have since ordered 2 more packages to complete the work on my son's room. So that's a total of 5. Mind you, I only needed one Roommates Transportation package that included cars and trucks, in order to cover the space. http://www.amazon.com/RoomMates-RMK1132SCS-Transportation-Stick-Decals/dp/B0013RE6AY/ref=sr_1_7?ie=UTF8&qid=1377781213&sr=8-7&keywords=roommates+cars