milepost

A post set up to indicate distance in miles, as along a highway.

A post set up to mark distance by miles along a highway or other line of travel.

A post, or one of a series of posts, set up to indicate spaces of a mile each or the distance in miles from a given place.

An event or accomplishment marking a significant advance in an endeavor; a notable achievment.

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

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)

stone post at side of a road to show distances