Dear Simutrans, In simutrans, cars will come to a sharp curve without warning, I think for this freeware game to be more realistic, curve signs stating a curve ahead and an optional speed to travel around the curve. Speeds around curves could range anywhere from 5 km/h to around 40 km/h. The important thing about these curve signs is that they will be placed automatically, but can be edited later.
Thanks,
Bub
This really falls outside the bounds of what Simutrans attempts to simulate. It would cost processing power with no real benefit to players.