New & Excited 3 Wheel Driver (goldwing Trike & Tow-pac Kit On Old Goldwing).

[floydv]

I have wondered about that also. I think one line is just the street pavement joint, but the other looks like it wraps around the tire. (?)
View attachment 7916

Looks to me like a zombie guard/tire scraper to protect the tire from sharp pieces of walking dead.