Rok važenja je na vozačkoj dozvoli.

Rok važenja means expiration date, validity period, or more literally the period of validity.

• rok = deadline, term, period, time limit
• važenja = of validity / of being valid

So the phrase is not word-for-word the same as English expiration date, but it is the normal Serbian way to express that idea in many contexts.

Because važenja is the genitive singular form of važenje.

The base noun is:

• važenje = validity

In the phrase rok važenja, the second noun depends on the first one, like period of validity in English. Serbian often expresses this with the genitive:

• rok važenja = period of validity
• datum rođenja = date of birth
• broj telefona = phone number

So važenja is there because it means of validity.

Because it comes after na, and here na means on in the sense of location, so Serbian uses the locative case.

The base form is:

• vozačka dozvola = driver’s license

After na for location:

• na vozačkoj dozvoli = on the driver’s license

The forms change like this:

• vozačka → vozačkoj
• dozvola → dozvoli

So na vozačkoj dozvoli is the locative singular form.

The dictionary form is vozačka dozvola.

That is the nominative singular form, the form you would normally find in a word list or dictionary.

Here is the contrast:

• vozačka dozvola = a driver’s license
• na vozačkoj dozvoli = on the driver’s license

This is a very common pattern in Serbian: adjectives and nouns both change form to match the case.

Because Serbian often uses a very simple structure here:

• X je na Y = X is on Y

So:

• Rok važenja je na vozačkoj dozvoli.

literally means:

• The expiration date is on the driver’s license.

You could also say:

• Rok važenja se nalazi na vozačkoj dozvoli.

But that is a bit more formal or explicit. In everyday Serbian, je na is completely natural.

Yes, in casual speech, very often.

Native speakers often shorten vozačka dozvola to just vozačka when the meaning is obvious:

• na vozačkoj = on the driver’s license

However, the full phrase na vozačkoj dozvoli is clearer and more standard, especially for learners or in formal contexts.

It is widely understood, but regional preferences can differ.

Common terms include:

• vozačka dozvola = driver’s license
• vozačka = colloquial short form

In some varieties, you may also hear slightly different official wording, but vozačka dozvola is a very safe and standard expression for learners.

Yes. Serbian word order is more flexible than English word order.

The neutral version is:

• Rok važenja je na vozačkoj dozvoli.

But you might also hear:

• Na vozačkoj dozvoli je rok važenja.

This version puts more focus on where it is.

Even though word order can change, the case endings still show the grammatical relationships, so the meaning stays clear.

Not always.

They are similar, but they are used in different contexts:

• rok važenja = validity period / expiration date for documents, cards, permits, and similar things
• rok trajanja = shelf life / expiration period, often for products, food, medicine, etc.

So for a driver’s license, rok važenja is the better choice.

Examples:

• Rok važenja pasoša = passport expiration date
• Rok trajanja mleka = milk expiration date / shelf life

Because Serbian does not have articles like English a and the.

So:

• Rok važenja je na vozačkoj dozvoli.

can mean:

• The expiration date is on the driver’s license
• or, depending on context, An expiration date is on a driver’s license

In real use, context tells you whether the meaning is definite or indefinite. In this sentence, English naturally uses the, but Serbian does not need to say it.

A rough pronunciation guide is:

• Rok = roughly rok
• važenja = VA-zhen-ya
• je = ye
• na = na
• vozačkoj = vo-ZACH-koy
• dozvoli = do-ZVO-lee

A few helpful sounds:

• ž sounds like the s in measure
• č sounds like ch in church
• j usually sounds like English y

So the whole sentence is approximately:

• Rok VA-zhen-ya ye na vo-ZACH-koy do-ZVO-lee.

Yes, it is natural and correct.

It sounds like a straightforward statement telling someone where to find the expiration date. Depending on context, native speakers might also say things like:

• Rok važenja piše na vozačkoj dozvoli. = The expiration date is written on the driver’s license.
• Na vozačkoj dozvoli je naveden rok važenja. = The expiration date is listed on the driver’s license.

But your original sentence is perfectly normal.