Cheaper bridge 6. Works for trucks and tank.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3496608664

WTF. Bridge 8 Tank Truck solution is cheaper than Truck solution and work for both of them :D

this is a working solution for bridge 7 tanker https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1865582362

for bridge 6 tanker I had to do this https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1865574832

Yeah I don't know what's going on, I might ask the devs about it.

kazerniel That sounds really weird, all of the solutions, are the ones i completed with (screenshot taken after completion)

Tank truck solution for Bridge 7 doesn't work, the truck's front doesn't touch the star. By now I tried out about 6 variations all allegedly working for someone, neither did work for me, wtf O.o

Good guide. Fuck bridge 7 and stupid ideas like this. It's not worth wasting time.
Props to Hamakei for solution.

re: Gardian06

If you or anybody else reading this guide hasn't managed to construct Bridge 7, I think I worked out how the game does it.

A piece only becomes road if it's connected to an existing road, or to the land. So, build the iron bridge right to left, then the wooden riser at the bottom left. Delete the iron bridge, and put a couple of temporary road pieces in heading right just above the star. Build the road to nowhere up to the top-right, then remove the temporary pieces and rebuild the iron bridge...

Better&Cheaper solution for Bridge 7:
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=571351654