Hm, Bridge 6 does not allow me so much money to use, only half or less. I made it for normal cars, but not for the lorries.
I have finished all other bridges on this island for lorries, so I don't know, if I can get some extra money after completing other islands too, or not, as @General M-13 suggested.

Bridge 7 doesnt work

omg the bridge number six is really hard to build

Thank for all your guides. These are helpful to have all the achivements of the game !

Bridge 3 and 4 looks exactly the same...

@ SD2.Wisp Divine YOLO - Your a) Doing it wrong (Remember use extra detail grid) and b) This solution is for tank trucks which you can't use until you've completed all islands with cars - only then do you get the extra budget to spend

none of these works for me .... and the money of all maps simlpy is fixed all the time ...

If you don't have enough money go complete all bridges for normal trucks first