Too easy to tell it's NOT mainland . License plate style/ color | Truck's shape | Triangular warning sign's color | balck/yellow at EVERY post (Maybe it's my own problem. My old man loves TV prog in 台語 after retirement . I watch those s*** occasionally when visits him )
That highway is in Miaoli county which locals mainly spokes Hakkanese. The detail pictures can found via "Google Street View".