Vozač je pokušao pretjecati kolonu, ali se brzo vratio u svoju traku.

Because this is the Croatian perfect tense, which is built with:

• the present of biti = je
• the past participle = pokušao

So je pokušao means tried.

Croatian often uses this tense where English uses the simple past. Without je, the sentence would be incomplete in standard modern Croatian.

Je is a clitic: a short unstressed word that usually goes in the second position in the clause.

So:

• Vozač je pokušao... = normal
• Je vozač pokušao... = not normal in standard word order

This second-position rule is very important in Croatian. The same thing happens later with se in ali se brzo vratio.

Pokušao is the masculine singular past participle of pokušati = to try.

It agrees with the subject:

• vozač is masculine singular
• so the participle is pokušao

Compare:

• Vozač je pokušao = a male driver tried
• Vozačica je pokušala = a female driver tried
• Vozači su pokušali = drivers tried

After pokušati, Croatian normally uses the infinitive:

• pokušati pretjecati = to try to overtake
• pokušati napraviti = to try to do/make
• pokušati otići = to try to leave

So pretjecati is simply the infinitive that depends on pokušao.

This is about aspect.

• pretjecati is imperfective
• it presents the action as ongoing, attempted, or in progress

That fits well with pokušao, because the sentence focuses on the attempt to overtake, not on successfully completing it.

A learner-friendly way to feel this is:

• pokušao pretjecati = he tried overtaking / tried to overtake
• it suggests an attempted maneuver, not a completed successful pass

Because kolonu is the accusative singular of kolona.

Here it is the direct object of pretjecati:

• pretjecati koga/što?
• kolonu

So:

• nominative: kolona
• accusative: kolonu

In this sentence, kolona means a line/queue of vehicles, not just a general column in the abstract.

Here se is part of the verb vratiti se = to return / to go back.

So you should learn this as a unit:

• vratiti se = to return
• vraćati se = to be returning / to return repeatedly

It is not a direct equivalent of English himself here. In many Croatian verbs, se is simply part of the normal verb form.

Vratio is the masculine singular past participle of vratiti se.

Again, it agrees with vozač:

• vozač = masculine singular
• therefore vratio

Compare:

• Vozač se vratio
• Vozačica se vratila
• Vozači su se vratili

Because u can take two different cases, depending on meaning:

• u + accusative = movement into somewhere
• u + locative = location in somewhere

Here the driver returned into his lane, so there is movement, which is why Croatian uses the accusative:

• u svoju traku

If you were describing location, you would use the locative:

• u svojoj traci = in his lane

Croatian often uses the reflexive possessive svoj when the possessor is the same as the subject.

Here:

• subject = vozač
• the lane belongs to that same driver

So u svoju traku means into his own lane.

If you said u njegovu traku, it could suggest someone else’s lane, or at least it would be less naturally reflexive. Using svoju makes the reference clear and idiomatic.

Because brzo is an adverb, and it modifies the verb vratio se:

• vratio se kako? = how did he return?
• brzo = quickly

Compare:

• brz vozač = a fast driver — adjective
• brzo se vratio = he returned quickly — adverb

The word order is somewhat flexible, but not completely free.

This sentence is very natural as:

• Vozač je pokušao pretjecati kolonu, ali se brzo vratio u svoju traku.

Some parts can move for emphasis, but the clitics still obey their rules:

• je
• se

They usually stay near the beginning of their clause, in second position.

For example, you could say:

• Vozač je kolonu pokušao pretjecati...

but that sounds more marked. The original is the most neutral and natural version for a learner to copy.

In traffic language:

• kolona = a line/queue of vehicles
• traka = a lane

So the situation is:

• the driver tried to pass a line of cars
• but quickly moved back into his lane

These are very common road-traffic words in Croatian.

Yes. The sentence uses vratio se, which is perfective and presents the return as a completed action.

That fits the context well:

• he tried to overtake
• then he quickly went back

If you used the imperfective vraćao se, it would sound more like an ongoing or repeated process of returning, which is not what this sentence wants.

So the aspect contrast is meaningful here:

• pretjecati = imperfective, attempted/ongoing action
• vratio se = perfective, completed return

This combination is very natural in Croatian.