What is the sign that the arrow is on called?
The sign is a traffic sign.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    7
2     1   to the left of    4
3     3               on    5
4     3  to the right of    4
5     3  to the right of    7
6     4  to the right of    0
7     4   to the left of    6
8     4   to the left of    5
9     4   to the left of    3
10    4  to the right of    1
11    4               on    7
12    5  to the right of    4
13    5  to the right of    7
14    6  to the right of    7
15    6  to the right of    4
16    7  to the right of    0
17    7   to the left of    3
18    7   to the left of    5
19    7   to the left of    6