mileposts

/M IH0 L IY1 P OW0 S T S/
noun
  1. 1

    A post on a highway, often with one or more fingerposts, showing the distance in miles to nearby places

  2. 2

    A sign or post beside a railway marking the distance from the (actual or nominal) start of a line (usually the principal terminus or junction with a more major line)

Source: https://en.wiktionary.org/wiki/milepost, https://en.wiktionary.org/wiki/mileposts