Intersections don't give positions

[Babwenbiber]

The positions for intersections seem not to work.
I get position -1 when driving over it.
I used the sample modular_intersection for it.
Steps to reproduce:

1. ./tragediy -I ~/com.anki.overdrive/ -p crossroad -j ~/com.anki.overdrive/files/expansion/assets/resources/basestation/config/mapFiles/racing/modular_intersection_test2.txt
   Output is WARNING: Encountered ambiguous location barcodes with the following road piece identifiers: 17 18
2. Check created crossroad_location-table.csv. => No Segment 4 10 (Which is intersection from what I understand)

Here the modular_intersection_test2.txt:
12
0 7 18 1200 0
0 7 34 1200 0
0 7 33 1200 0
0 7 17 1200 0
0 7 23 1200 0
0 7 40 1200 0
0 4 10 1200 0
0 7 39 1200 0
0 7 17 1200 1
0 7 18 1200 1
0 7 36 1200 0
0 7 20 1200 1
13
0 1 1 0
1 1 2 0
2 1 3 0
3 1 4 0
4 1 5 0
5 1 6 2
6 3 7 0
7 1 8 1
8 0 9 1
9 0 10 0
10 1 11 1
11 0 6 1
6 0 0 0
1 0 0.0 0.15
1300 600 1.5708

BTW: Is it even possible to scan (and get different positions from) tracks with two segments with the same id?

Furthermore, is there a documentation how to create your own track.txt? Or is it strictly under anki license?

Thanks

[fuleu]

Do you know what type of optical sensor anki drive uses?