[13.19] Trains take an extra lap through the roundabout

[Rick]

As stated in the subject, the train AI seems to be broken a bit. So the trains do not take the right exit when they drive in and take an extra lap. This only seems to happen when it is the exit right after the entry into the roundabout. This also happens when I drive it manually. I tryed to show it in the pictures but my paint skills are limited

I hope you got an idea of the problem and i hope you can fix it soon

Rick

[Loewchen]

Please upload a save file with focus on the junction some time before a train comes and takes that unfavourable route.
Please don't use any mods for that save.

[Mehve]

90% certain that this isn't a bug - the problem is that some of the curves aren't actually continuous. See the picture below:



Two similar curved rails, taken from such a circle (this would be the lower-right right angle turning). While they seem to connect at first glance, if you look closely you can see that they're actually crossing each other slightly, which doesn't count as a connection. For your situation, you'll need to either enlarge the roundabout circle, or pull the main rails towards each other (only two rail spaces between them, not four).

Again, pretty sure that's what happening here. Very tricky to visually spot when the inner circle is also present. Symptoms include the inability to turn any corners in the roundabout, while maintaining the ability to go straight through in any direction.

[golfmiketango]

90% certain that this isn't a bug - the problem is that some of the curves aren't actually continuous. See the picture below:



Two similar curved rails, taken from such a circle (this would be the lower-right right angle turning). While they seem to connect at first glance, if you look closely you can see that they're actually crossing each other slightly, which doesn't count as a connection. For your situation, you'll need to either enlarge the roundabout circle, or pull the main rails towards each other (only two rail spaces between them, not four).

Again, pretty sure that's what happening here. Very tricky to visually spot when the inner circle is also present. Symptoms include the inability to turn any corners in the roundabout, while maintaining the ability to go straight through in any direction.

Gotcha! hehehe

This is surely one of those non-bug things that need fixing in factorio. It's insanely subtle; depending on how good your vision is, you simply may not be able to ever tell the difference.

[Rick]

90% certain that this isn't a bug - the problem is that some of the curves aren't actually continuous. See the picture below:



Two similar curved rails, taken from such a circle (this would be the lower-right right angle turning). While they seem to connect at first glance, if you look closely you can see that they're actually crossing each other slightly, which doesn't count as a connection. For your situation, you'll need to either enlarge the roundabout circle, or pull the main rails towards each other (only two rail spaces between them, not four).

Again, pretty sure that's what happening here. Very tricky to visually spot when the inner circle is also present. Symptoms include the inability to turn any corners in the roundabout, while maintaining the ability to go straight through in any direction.

Wow after some short testing I saw that this is the case, but because of the exits not that obvious as in your blueprint. But anyway thanks you two and sory for reporting a bug where there is none.

Rick