Skiltet ved broen er klart nok til at vise, hvor fortovet begynder.

Because skiltet is the definite form of et skilt (a sign).

• et skilt = a sign
• skiltet = the sign

In Danish, nouns often add an ending to show the instead of using a separate word like English does.

Since the sentence is talking about a specific sign, Danish uses skiltet.

For the same reason: broen is the definite form of en bro.

• en bro = a bridge
• broen = the bridge

So ved broen means by the bridge or near the bridge.

Ved usually means by, near, or at depending on context.

In ved broen, it means something like:

• by the bridge
• near the bridge

So it tells you the location of the sign.

Because skiltet comes from et skilt, and skilt is a neuter noun.

In Danish, adjectives often agree with the noun:

• en-word: klar
• et-word: klart

So:

• et klart skilt = a clear sign
• skiltet er klart = the sign is clear

The -t is there because skilt is an et-word.

Nok til at means enough to.

So:

• klart nok til at vise = clear enough to show

This is a very common pattern in Danish:

• stor nok til at nå det = big enough to reach it
• gammel nok til at køre bil = old enough to drive a car

So the structure is:

adjective + nok til at + infinitive

Because at vise is the infinitive form, meaning to show.

After nok til at, Danish uses the infinitive:

• nok til at forstå = enough to understand
• nok til at se = enough to see
• nok til at vise = enough to show

If you said viser, that would be a finite present-tense verb (shows), which would not fit this structure.

Hvor means where here.

It introduces a clause that explains what location is being shown:

• hvor fortovet begynder = where the sidewalk begins

So the sign is clear enough to show where something starts.

Because hvor fortovet begynder is a subordinate clause.

In Danish, it is standard to put a comma before subordinate clauses like this:

• ..., hvor ...
• ..., at ...
• ..., som ...
• ..., fordi ...

So the comma helps mark the extra clause:

Skiltet ved broen er klart nok til at vise, hvor fortovet begynder.

Because it means the sidewalk, not a sidewalk.

• et fortov = a sidewalk / a pavement
• fortovet = the sidewalk / the pavement

The sentence refers to a specific sidewalk, so Danish uses the definite form.

Begynder is the present tense of at begynde (to begin).

So:

• at begynde = to begin
• begynder = begins / is beginning

In hvor fortovet begynder, the meaning is where the sidewalk begins.

Because after hvor here, Danish uses subordinate clause word order, not main-clause word order.

Compare:

• Main clause question: Hvor begynder fortovet? = Where does the sidewalk begin?
• Subordinate clause: ..., hvor fortovet begynder = ..., where the sidewalk begins

In subordinate clauses, Danish normally keeps the subject before the verb:

• fortovet begynder

This is very important, because Danish main clauses often use verb-second word order, but subordinate clauses usually do not.

Here it most naturally means clear enough or easy enough to understand/read.

With signs, klar often means that something is:

• visually clear
• understandable
• unambiguous

So skiltet ... er klart nok suggests the sign is sufficiently clear to indicate where the sidewalk starts.

Depending on context, klart can also mean obvious, but in this sentence clear is the best match.

Yes. At vise means to show and is very natural here.

A sign can:

• vise vejen = show the way
• vise retningen = show the direction
• vise, hvor noget begynder = show where something begins

So til at vise, hvor fortovet begynder is idiomatic Danish.

Yes. Danish often allows small variations. For example:

• Skiltet ved broen er tydeligt nok til at vise, hvor fortovet begynder.
• Skiltet ved broen viser tydeligt, hvor fortovet begynder.

But the original sentence is perfectly natural. It emphasizes that the sign is clear enough for the purpose of showing where the sidewalk begins.

A useful breakdown is:

• Skiltet ved broen = subject phrase
• er = verb
• klart nok = adjective phrase
• til at vise = infinitive phrase showing result/purpose
• hvor fortovet begynder = subordinate clause

So the full pattern is roughly:

[subject] + [is] + [adjective + nok] + [til at + infinitive] + [subordinate clause]

That makes this a very helpful model sentence for learning Danish grammar.