Na pješačkom prijelazu vozači moraju propustiti pješake.

Because na is the preposition normally used with places like crossings, squares, stations, etc., and here it means at/on the pedestrian crossing.

After na:

• locative is used for location: na pješačkom prijelazu = at the pedestrian crossing
• accusative is used for movement toward something: na pješački prijelaz = onto/to the pedestrian crossing

So in this sentence, the action happens at that location, which is why Croatian uses the locative.

The basic form is pješački prijelaz.

Here is what changed:

• pješački → pješačkom
• prijelaz → prijelazu

Both words changed because they are in the locative singular after na.

So:

• nominative: pješački prijelaz
• locative: na pješačkom prijelazu

Because they are in different cases and have different jobs in the sentence.

• vozači = drivers → the subject, so it is in the nominative plural
• pješake = pedestrians → the direct object, so it is in the accusative plural

Compare:

• singular: vozač, pješak
• nominative plural: vozači, pješaci
• accusative plural: vozače, pješake

So Croatian marks who is doing the action and who is receiving it by changing the endings.

Because pješake is the accusative plural, and the verb propustiti takes a direct object.

• pješaci = pedestrians as the subject
• pješake = pedestrians as the object

For example:

• Pješaci čekaju. = Pedestrians are waiting.
• Vozači moraju propustiti pješake. = Drivers must let pedestrians pass.

English mostly keeps the same form, but Croatian changes it.

Moraju is the 3rd person plural present tense of morati, meaning must / have to.

Conjugation of morati:

• ja moram
• ti moraš
• on/ona mora
• mi moramo
• vi morate
• oni/one moraju

So vozači moraju means drivers must.

Because after morati, Croatian normally uses an infinitive, just like English uses the base verb after must.

• moraju propustiti = must let pass / must yield to

This is the normal pattern:

• moram ići = I must go
• moraju stati = they must stop
• morate čekati = you must wait

So morati + infinitive is a very common structure.

Yes. In this sentence, propustiti means something like:

• let pass
• allow to go first
• yield to

In traffic language, propustiti pješake means to stop or slow down so pedestrians can cross.

Be careful: propustiti can also mean other things in other contexts, such as:

• miss something
• omit something
• let through

Here the traffic meaning is the important one.

Croatian verbs often come in aspect pairs:

• propustiti = perfective
• propuštati = imperfective

In this sentence, propustiti presents the action as a complete, required act: the drivers must perform the act of yielding to the pedestrians.

In rules, instructions, and regulations, Croatian often uses the perfective infinitive after modal verbs like morati.

You may also hear imperfective forms in more general or habitual contexts, but moraju propustiti pješake sounds very natural for a traffic rule.

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

So:

• vozači can mean drivers or the drivers
• pješake can mean pedestrians or the pedestrians
• na pješačkom prijelazu can mean at a/the pedestrian crossing

Which one is meant depends on context. In general statements like this one, English often uses the in translation, but Croatian simply does not need it.

No, Croatian word order is fairly flexible because the case endings show the grammatical roles.

The original order:

• Na pješačkom prijelazu vozači moraju propustiti pješake.

This is very natural and sounds like a rule or official statement. It starts with the location, which gives the sentence a clear traffic-rule feel.

You could also say:

• Vozači moraju propustiti pješake na pješačkom prijelazu.

That is also understandable, but the original version is especially natural in formal instructions and regulations.

Yes. Pješački prijelaz is the standard term.

It is made from:

• pješački = pedestrian
• prijelaz = crossing

In everyday speech, people may also say zebra for a zebra crossing, but pješački prijelaz is the standard and neutral expression, especially in formal language like road rules.

A few useful points:

• pj in pješački is pronounced together, roughly like pye
• je in pje- and prije- is pronounced clearly
• š sounds like English sh
• č sounds like ch in church

So approximately:

• pješačkom ≈ pye-SHA-chkom
• prijelazu ≈ prye-LA-zoo

You do not need a perfect English approximation, but it helps to remember:

• š = sh
• č = harder ch

It actually is prijelazu. The basic noun is prijelaz, and in the locative singular it becomes prijelazu.

So:

• nominative: prijelaz
• locative: na prijelazu

There is no extra change inside the word other than the normal case ending -u. The i is already part of the basic form prijelaz.