What do you think are the numbers on?
The numbers are on the street sign.
    src        edge_attr  dst
0     0          next to   10
1     0             near   10
2     0  to the right of   10
3     1               on    3
4     1   to the left of    5
5     3               on    5
6     3               on   10
7     3  to the right of   10
8     3   to the left of    5
9     4   to the left of   11
10    4   to the left of    7
11    4   to the left of    8
12    5  to the right of    3
13    5  to the right of    1
14    6               on    3
15    6  to the right of   10
16    7  to the right of    8
17    7  to the right of    4
18    7  to the right of   11
19    8   to the left of    7
20    8  to the right of    4
21    9       growing by    0
22   10   to the left of    3
23   10   to the left of    6
24   10             near    0
25   10   to the left of    0
26   11  to the right of    4
27   11   to the left of    7