milepost

Từ điển Oxford Advanced Learner 8th

mile·post [milepost mileposts] BrE [ˈmaɪlpəʊst] NAmE [ˈmaɪlpoʊst] noun (especially NAmE)
1. a post by the side of the road that shows how far it is to the next town, and to other places
2. = ↑milestone (¹)