Pic is definitely hard to read. It looks like some of your supporting info is actually a better description for your nomination than the actual nomination is, though. It looks like you didn't really do a very good job selling this as a trail sign. I would specifically describe it as such if that's accurate. Use the supporting info to talk about the walking trail, either linking to the help shift article where Niantic clarifies these as valid or info like how long the trail is and sights you might see along it or such.
Answers
What were the reasons for its rejection?
The photo is unclear - is this a standard roadsign pointing towards different cities, or is this a trail head, pointing to different walking routes?
The picture you have uploaded is illegible on here, can you do another one ?
Pic is definitely hard to read. It looks like some of your supporting info is actually a better description for your nomination than the actual nomination is, though. It looks like you didn't really do a very good job selling this as a trail sign. I would specifically describe it as such if that's accurate. Use the supporting info to talk about the walking trail, either linking to the help shift article where Niantic clarifies these as valid or info like how long the trail is and sights you might see along it or such.