Me kävelemme tietä pitkin.

We walk along the road.

Breakdown of Me kävelemme tietä pitkin.

• kävellä: to walk
• me: we
• tie: the road
• pitkin: along

Questions & Answers about Me kävelemme tietä pitkin.

What does each word in Me kävelemme tietä pitkin mean literally?

Word by word:

• me = we
• kävelemme = (we) walk / (we) are walking
  
  • from the verb kävellä = to walk
• tietä = road in the partitive singular (literally: (some) road / of the road / the road (as a path))
  
  • basic form (nominative): tie = road
• pitkin = along

So a fairly literal rendering is:
We walk road (partitive) along. → We walk along the road.

Why do we need me if kävelemme already means we walk?

In Finnish, the personal ending on the verb already shows the subject:

• kävele-n = I walk
• kävele-t = you (sing.) walk
• kävele-mme = we walk
• etc.

So grammatically you can say:

• Kävelemme tietä pitkin. = We walk along the road.

Without me, the sentence is still complete and natural.

Why is me used then?

• To emphasize or make the subject very clear:
  Me kävelemme tietä pitkin. = We are the ones who walk along the road (not someone else).
• In everyday speech and writing, subject pronouns appear quite often, especially at beginner and intermediate levels, or for emphasis and contrast.

So me is optional here; it is not wrong, it just adds clarity/emphasis.