Is the color of the stop sign the same as the car?
Yes, both the stop sign and the car are white.
    src        edge_attr  dst
0     1   to the left of    7
1     1   to the left of    2
2     1  to the right of    9
3     2  to the right of   15
4     2  to the right of    9
5     2  to the right of    1
6     3   to the left of    9
7     3  to the right of    8
8     3   to the left of   15
9     4  to the right of    6
10    4  to the right of    8
11    5  to the right of    9
12    5  to the right of   15
13    6   to the left of    4
14    6   to the left of    8
15    7  to the right of   15
16    7  to the right of    9
17    7  to the right of    1
18    8   to the left of    3
19    8  to the right of    6
20    8   to the left of   15
21    8   to the left of    4
22    9   to the left of    1
23    9   to the left of    2
24    9  to the right of    3
25    9   to the left of    7
26    9   to the left of    5
27   15  to the right of    8
28   15   to the left of    5
29   15   to the left of    2
30   15   to the left of    7
31   15  to the right of    3