Tko god vozi noću, mora paziti na smjerokaze, tunel i umorne vozače.

Tko god means whoever or anyone who.

In this sentence, Tko god vozi noću means Whoever drives at night.

A useful breakdown is:

• tko = who
• god = a particle that adds the sense of -ever, any, or no matter who

So:

• Tko vozi noću = Who drives at night? / The person who drives at night
• Tko god vozi noću = Whoever drives at night

It is a very common Croatian way to make general statements.

Because tko god is grammatically treated as singular.

So Croatian uses:

• Tko god vozi noću, mora paziti...

not:

• Tko god voze noću...

This is similar to English using singular in sentences like Whoever drives at night must be careful. Even though it refers to people in general, the grammar is singular.

That is why you also get mora later in the sentence, not moraju.

Noću means at night or during the night.

It is an adverbial form built from noć (night). For a learner, the easiest thing is to remember noću as a fixed time expression meaning:

• by night
• at night

Examples:

• Radim noću. = I work at night.
• Ne volim voziti noću. = I don't like driving at night.

So in your sentence:

• vozi noću = drives at night

This is a standard Croatian pattern:

• morati
  • infinitive

So:

• mora = must / has to
• paziti = to watch out / to pay attention / to be careful

Together:

• mora paziti = must pay attention / must be careful

This is very similar to English modal structures.

Examples:

• Moram ići. = I must go.
• Mora raditi. = He/She must work.
• Moraju čekati. = They must wait.

In your sentence, the subject is grammatically singular, so it is mora.

With paziti, Croatian often uses the preposition na when the meaning is:

• watch out for
• pay attention to
• be careful about

So:

• paziti na smjerokaze = pay attention to the road signs
• paziti na djecu = watch out for the children

This is something you mostly need to learn as a verb pattern:

• paziti na + accusative

So the noun after na usually goes into the accusative case.

Smjerokaze is the accusative plural of smjerokaz.

The dictionary form is:

• smjerokaz = signpost / directional sign

Because it follows na after paziti na, it must be in the accusative:

• nominative singular: smjerokaz
• nominative plural: smjerokazi
• accusative plural: smjerokaze

So:

• paziti na smjerokaze = pay attention to the signposts / road signs

A learner may notice that this looks different from the nominative plural, and that is normal.

Because tunel is a masculine inanimate noun, and in the singular, the accusative is the same as the nominative.

So:

• nominative: tunel
• accusative: tunel

That is why the sentence has:

• na tunel

not:

• na tunela

Compare:

• Vidim tunel. = I see a tunnel.
• Tunel je dug. = The tunnel is long.

Both use tunel in form, even though the case is different.

Because this is the accusative plural of an animate masculine noun.

The dictionary form is:

• vozač = driver

Since vozač refers to a person, it is animate, and masculine animate nouns change differently in the accusative.

Here are the forms:

• nominative plural: umorni vozači = tired drivers
• accusative plural: umorne vozače = tired drivers as the object

Since it comes after na in paziti na, Croatian uses the accusative:

• na umorne vozače

The adjective also changes to match the noun:

• umorni → nominative plural masculine animate
• umorne → accusative plural masculine animate

This is a very important pattern in Croatian.

The comma separates the introductory clause from the main clause.

Structure:

• Tko god vozi noću, = subordinate clause
• mora paziti... = main clause

So the sentence is organized like:

• Whoever drives at night, must pay attention...

In natural English, that comma is sometimes omitted, but in Croatian this kind of clause separation is very normal and expected.

That is just because the sentence is listing several things the driver should watch out for:

• smjerokaze = road signs (plural)
• tunel = the tunnel / a tunnel (singular)
• umorne vozače = tired drivers (plural)

Croatian does not need all items in a list to have the same number. The important thing is that they all match the required case, here the accusative after na.

So the structure is:

• paziti na
  • accusative item 1 + accusative item 2 + accusative item 3

Croatian does not have articles like English the and a/an.

So nouns like:

• smjerokaze
• tunel
• umorne vozače

can mean:

• road signs / the road signs
• a tunnel / the tunnel
• tired drivers / the tired drivers

The exact meaning depends on context.

That is why Croatian learners of English often struggle with articles, and English speakers learning Croatian often look for them even though they are simply not there.

Yes. Croatian has other ways to express a general subject.

For example:

• Svatko tko vozi noću mora paziti... = Everyone who drives at night must pay attention...

This is very close in meaning to:

• Tko god vozi noću, mora paziti...

The difference is mostly one of style and emphasis:

• tko god = whoever
• svatko tko = everyone who

Both are natural, but tko god sounds especially like a broad, general rule.

It depends on context. Paziti is a flexible verb.

In this sentence, good English translations include:

• must watch out for
• must pay attention to
• must be careful about

That is because paziti na often combines the ideas of:

• noticing something,
• being careful around it,
• keeping it in mind.

So here mora paziti na smjerokaze, tunel i umorne vozače is not just literal visual watching. It means the driver must stay alert to those things.