What I See: Traffic Jam

What I See: Traffic Jam
Well... Here is the answer
1234-5678
12345-678
123-54678
12-354678
1253-4678
125364-78
1253647-8
12536-748
125-63748
1-5263748
-15263748
51-263748
5162-3748
516273-48
51627384-
5162738-4
51627-834
516-72834
5-6172834
56-172834
5671-2834
567182-34
56718-234
567-81234
5678-1234