So thats why my bridges are... well just halfs?
It looks kinda silly, or is it a graphical bug?
After researching that advancement i will get normal looking bridges?
I have to say that, i run Civ 4 on my old GeForce 2 MX 400, although i get no waves on water, the game runs t like 10-15 FPS which is enough for a turn strategy

(note: Demo version)