2) I've got to hit the road! 我要上路了(必须要走了)!

To hit the road = to leave!

补充与hit有关的短语

hit the sack 睡觉，就寝
hit the book 读书

So Sorry, Now Andy has to say, I don't have all day! My students are waiting for me. I have got to hit the road! See ya, guys!