Did you set up in navigation that iGO should take highways ? (don't know the exact location of that setting by heart - it's where you enable or disable paved roads, toll roads, ferries, etc)

And of course the ftr files should be in the map folder.

Yes I enabled Highways and toll roads and ftr files are in maps folder. Navigation avoids low bridges but goes only on local roads. Hight is 4m and weght is 30 tons. It should navigate me on Highways.

Hmmm.
Question: on normal roads, did you notice any problems with bridges or weight restrictions?

I am asking with this in mind: (1) on highways you will have more chance to drive under bridges than on normal roads and (2) reading about bridges and weight in this thread: http://www.navitotal.com/showthread.php?10402-Navteq-2012-Q1-Incorrect-Bridge-heights.
I don't say it is the same or similar issue, but one never knows. You may find out setting up a route that you have to pass under a bridge and then demo the route.

The only working combination for bridges is R3 TomTom 2011.12 111230 on Primo 9.2.1.179499. But on that combination highways are problem. Whith any other maps bridges dont work. I've downloaded 3 diferent maps but they dont see bridges. I'll try with changing dimensions but I would be glad to have everithing working normal.

Thanks in advance for all of your help.