Aller à pied...............is always followed by the destination you're getting to:

Question

In the lesson it states that "Aller à pied (literally going by foot) is used when walking is contrasted with another means of transport - walking instead of driving for example - and is always followed by the destination you're getting to:"
But an example given is:
Je voulais prendre le bus, mais finalement j'y suis allé à pied.
In what sense is "allé à pied" followed by the destination in this example?

Accepted Answer

Bonjour Paul,
The adverbial pronoun y is standing in for à + [destination] in this example: https://french.kwiziq.com/revision/grammar/the-adverbial-pronoun-y-means-there
The point is that you can't say : ... mais finalement je suis allé à pied. 
I hope this helps, Bonne continuation !