#Dan will judge his people

Here "Dan" stands for his descendants. AT: "The descendants of Dan will judge their people" (See: [[:en:ta:vol2:translate:figs_metonymy]])

#his people

Possible meanings for "his people" are 1) "the people of Dan" or 2) "the people of Israel"

#Dan will be a snake beside the road

Jacob speaks about Dan and his descendants as if they were snakes. Though a snake is small, it but can bring down a rider off his house, so is Dan, though a small tribe, is very dangerous to its enemies. AT: "The descendants of Dan will be like a snake beside the road"  (See [[:en:ta:vol1:translate:figs_metaphor]])

#I wait for your salvation, Yahweh

The abstract noun "salvation" can be translated as "save." AT: "I wait for you, Yahweh, to save me"

#I wait

The word "I" refers to Jacob.