Engineers --> Bridges --> Armor?

[Plain Ian]

A bridge built by engineers is considered a heavy bridge and so anything can cross, only if there is difficult terrain on the hex's it spans over the river between (i.e marsh/swamp) could you have issues moving mechanised units.

Adding a few lines in the manual to say this would be helpful for new players. 

My Gold User pdf says it was last updated Oct 14 2012. I think we need an update?

Good advice though on where to build the bridge. I think if you build a bridge between hexes which have roads on them then you gain the benifit of being able to use road movement through the hexside.........I think?