Are there any clocks or traffic lights?
Yes, there is a traffic light.
    src        edge_attr  dst
0     0  to the right of    6
1     1               in    0
2     1            above    5
3     3  to the right of    5
4     3  to the right of    7
5     3  to the right of    6
6     3  to the right of   14
7     3  to the right of   12
8     4               on   15
9     4   to the left of    8
10    4   to the left of   15
11    5            below    1
12    5   to the left of    3
13    6   to the left of    3
14    6   to the left of    0
15    7   to the left of    3
16    7   to the left of   13
17    8           beside    4
18    8  to the right of    4
19    9   to the left of   10
20   10  to the right of    9
21   12   to the left of    3
22   13  to the right of    7
23   14   to the left of    3
24   15  to the right of    4