This isn't mine i'm just providing a link to it. Helped me knock out the rest of the gates there is another link to the page from the walkthrough of x360a.org.http://www.mynfs.net/mostwanted2012/gamemap.php
Credit goes to mynfs.net
Edit: The map is interactive you can click the dot to make it greyed out, how every you will get a message saying this feature is not avalible (or something to that effect) but it still works. just hit enter and keep going or you can sign up and it should shouldnt come up again.
Edit #2: WARNING!! Be aware that the game suffers from an archiving issue related to the gates. Some how I believe this has to do with the autolog system. I experienced something to this effect when going through areas I had all but one gate missed some how. However I was lucky, some have report in the comments that they cannot get the last gate to register and have had to start a new game to get the game to register the missing gate.
Update: apparently he link is dead now. http://nfsmw.shinedalgarno.de/
this link will take you to a different interactive map. Thx Sneezesomemilk.