Trade Routes - Exactly how do they work?

I know you can stop a trade route by simply stopping soldiers on the road (notice the disapperance of trade wagons). But exactly how does it effect your towns that do get cut off. Moral? Income? and more.

Also do i have a chance to stop the trade routes before.
For example

I notice in my turn that a rebel army has moved upon my trade route. Will my trade be able to continue to trade that turn or has the rebel army stopped in my first turn already. Or does the rebel has to stay there for the duration of one complete turn (theirs) before the Trade comes to a complete halt?

Help needed.

Are you sure this isn't just a graphical difference? check the city info sheet to be sure. i haven't noticed this, but it's possible.

don't think trade affects order, unlike mtw. Just reduces income.

Its a good question Haido. I'm going to be looking at this more as I can. I have a suspicion that in the settlement detail screen when you see the trade (and corruption) icons fading in and out it means that trade is interdicted somewhere. I believe some trade gets through.

I thought the fading icons were the "maybe extra" [income/destruction/whatever], and the static ones the "minimum" [income/destruction/whatever].

Can't find it in the manual (just says "it is detailed on that screen" on p29/30, with no additinal info)