What do the black-and-white and black-and-yellow striped marker boards at the bridge shown indicate?

These aid edge visibility, especially at night. They do not identify parking, underground services or terrain below; slow and watch opposing traffic.

ʻOku nau tokoni ke sio ki he tapa, tautefito ki he poʻuli. ʻOku ʻikai te nau fakaʻilongaʻi ʻa e tau, ngaahi paipa pe uaea ʻi lalo kelekele, pe tuʻunga kelekele ʻi lalo; fakasiʻisiʻi ʻa e vave pea tokanga ki he feʻaluʻaki ʻoku haʻu mei muʻá.