How large is the van on the road?
The van is small.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   10
2     0  to the right of    7
3     0  to the right of    4
4     1  to the right of    5
5     1   to the left of    2
6     2  to the right of    1
7     2  to the right of   10
8     2  to the right of   12
9     3   to the left of   12
10    3   to the left of   10
11    4               on    3
12    4   to the left of    0
13    5   to the left of   14
14    5   to the left of    1
15    5   to the left of   15
16    5   to the left of   11
17    6   to the left of   11
18    6   to the left of   13
19    6   to the left of   16
20    6   to the left of   17
21    7   to the left of    0
22    9               on   13
23    9  to the right of   17
24    9  to the right of   16
25    9  to the right of   18
26   10  to the right of    3
27   10  to the right of   11
28   10   to the left of    2
29   10  to the right of    0
30   11   to the left of   10
31   11  to the right of    6
32   11  to the right of    5
33   12   to the left of    2
34   12  to the right of    0
35   12  to the right of    3
36   12               of   10
37   13  to the right of    6
38   14  to the right of    5
39   14  to the right of   15
40   15   to the left of   14
41   15  to the right of    5
42   16  to the right of    6
43   16               on   11
44   16   to the left of    9
45   16   to the left of   17
46   16   to the left of   18
47   17  to the right of    6
48   17   to the left of    9
49   17  to the right of   16
50   17   to the left of   18
51   18  to the right of   16
52   18  to the right of   17
53   18   to the left of    9