Im bliżej szczytu jesteśmy, tym lepiej widać znak szlaku.

It is the standard Polish way to express the more ..., the more ... or the closer ..., the better ... type of comparison.

So:

• Im bliżej szczytu jesteśmy, tym lepiej widać znak szlaku. means:
• The closer to the summit we are, the better the trail marker can be seen.

A few similar examples:

• Im więcej ćwiczysz, tym lepiej mówisz po polsku.
  = The more you practise, the better you speak Polish.
• Im później wyjdziesz, tym większy będzie ruch.
  = The later you leave, the heavier the traffic will be.

This construction is very common and very useful.

No. In this sentence, im does not mean than.

In comparative constructions like this, im introduces the first part of the pattern:

• im ...
• tym ...

Together they mean something like:

• the ...
• the ...

So:

• im bliżej = the closer
• tym lepiej = the better

This im is a fixed part of this construction and should be learned as a pattern rather than translated word-for-word.

Bliżej is the comparative form of blisko (close / near).

Forms:

• blisko = close / near
• bliżej = closer / more closely

So:

• Im bliżej szczytu jesteśmy... literally means:
• The closer to the summit we are...

Notice that Polish often uses comparatives in this pattern even when English uses a full clause like the closer we are to the summit.

Because bliżej requires the genitive case.

The base noun is:

• szczyt = summit / peak

Its genitive singular form is:

• szczytu

So:

• bliżej szczytu = closer to the summit

This is a very common pattern in Polish. Many words expressing comparison, distance, or proximity can govern the genitive.

Similar examples:

• bliżej domu = closer to home
• dalej miasta = farther from the city

Yes, the word order can vary.

In this sentence:

• Im bliżej szczytu jesteśmy...

the verb jesteśmy comes later because Polish word order is flexible and often used for rhythm, emphasis, or style.

A more neutral or more English-like order would be:

• Im jesteśmy bliżej szczytu, tym lepiej widać znak szlaku.

But the original version sounds very natural and elegant in Polish.

Polish often places the verb later in comparative or descriptive clauses, especially when the speaker wants the comparative phrase to come first.

Not normally in standard Polish.

The most natural options are:

• Im bliżej szczytu jesteśmy...
• Im jesteśmy bliżej szczytu...

But bliżej naturally goes together with szczytu, so splitting them up too much sounds less natural.

Think of bliżej szczytu as a unit:

• closer to the summit

Because widać is an impersonal form meaning something like:

• one can see
• it is visible
• it can be seen

So:

• tym lepiej widać znak szlaku means:
• the better the trail marker can be seen or
• the more clearly the trail marker is visible

If you said:

• tym lepiej widzimy znak szlaku

that would mean:

• the better we see the trail marker

That version is also possible, but it focuses more directly on we as the people doing the seeing.

The original sentence sounds a bit more general and natural in descriptive narration.

Widać is an impersonal predicate. It is very common in Polish.

It is used when Polish does not want to specify a subject, or when the idea is more about visibility than about a person actively seeing something.

Examples:

• Widać góry. = The mountains are visible. / You can see the mountains.
• Stąd widać jezioro. = You can see the lake from here.
• Nic nie widać. = You can’t see anything. / Nothing is visible.

So in your sentence:

• tym lepiej widać znak szlaku = the better the trail marker is visible / can be seen

Znak means sign or marker, and szlaku is the genitive form of szlak (trail, route).

So:

• znak szlaku = trail marker / trail sign

Literally it is:

• sign of the trail

This is a normal noun + genitive structure in Polish, where English often uses a compound noun.

Similar examples:

• mapa miasta = city map
• drzwi domu = the house door / the door of the house
• kolor nieba = the colour of the sky

Because it depends on znak in a possessive/descriptive relationship:

• znak czego? = sign of what?
• szlaku = of the trail

The base noun is:

• szlak = trail

Its genitive singular is:

• szlaku

So:

• znak szlaku = the trail’s marker / the sign of the trail

This is one of the most common uses of the genitive in Polish.

It is primarily literal here: as you get closer to the summit, the trail marker becomes easier to see.

So the sentence suggests a physical situation, such as hiking in the mountains.

However, lepiej widać can sometimes be used more broadly in Polish, just like English it becomes clearer. In this particular sentence, though, the most natural reading is literal visual visibility.

Not without changing the meaning.

Compare:

• lepiej widać znak szlaku = the trail marker is easier to see
• lepiej widać szlak = the trail itself is easier to see

Both are possible in the right context, but they refer to different things:

• znak szlaku = a sign/marker showing the trail
• szlak = the trail/route itself

It sounds natural and correct. It is not overly formal.

That said, the word order:

• Im bliżej szczytu jesteśmy...

has a slightly polished, elegant feel compared with a more straightforward:

• Im jesteśmy bliżej szczytu...

Both are normal, but the original sentence sounds especially good in descriptive writing or speech.

Yes — it gives you a very useful model:

• Im + comparative..., tym + comparative...

Examples:

• Im szybciej idziemy, tym wcześniej dojdziemy.
  = The faster we walk, the earlier we will arrive.
• Im dłużej czekasz, tym bardziej się denerwujesz.
  = The longer you wait, the more nervous you get.
• Im wyżej jesteśmy, tym zimniej jest.
  = The higher we are, the colder it is.
• Im więcej czytasz, tym więcej rozumiesz.
  = The more you read, the more you understand.

So this sentence is a very good pattern to learn and reuse.