What does it mean to enter the snow drift on Tianfeng Road?

Tianlufeng, which walks into a snowdrift, refers to the horse's zodiac sign.

Walk into the snowdrift of Paradise Road. Bai Xuege Farewell to Wu Gui, a poem written by a poet in Tang Dynasty. Luntai East Gate, welcome to the capital. Go, the mountain road is covered with snow. I haven't seen you in the winding mountain road, leaving only a row of horseshoe prints. This poem describes the magnificent scenery of the snow in August in the Western Regions, expresses the feelings of seeing off guests at the Great Wall and seeing them off in the snow, and expresses sadness and homesickness, but it is full of whimsy and does not make people feel sad. The romantic ideal and strong feelings expressed in the poem make people feel that the snow outside the Great Wall has become an object worth pondering and appreciating. This poem mentions that the horse is the symbol of the zodiac.