Na raskrižju je velika gužva, pa idemo pješice.

Because na is being used here to mean at / on a location, so raskrižje goes into the locative case.

• base form: raskrižje = intersection, crossroads
• locative singular: raskrižju
• so: na raskrižju = at the intersection

A very useful pattern is:

• na + locative = location
• na + accusative = movement toward a place

Compare:

• Na raskrižju je gužva. = There is traffic at the intersection.
• Idemo na raskrižje. = We are going to the intersection.

Yes. Raskrižje usually means intersection, crossroads, or junction, depending on context.

In this sentence, the most natural English idea is probably intersection or crossroads.

You may also encounter another Croatian word, raskršće, which can mean much the same thing. In everyday use, both can refer to a road crossing.

Croatian word order is more flexible than English word order. The sentence begins with the location for emphasis:

• Na raskrižju je velika gužva.

This is very natural in Croatian and means something like:

• At the intersection, there is heavy traffic.

You could also hear:

• Velika je gužva na raskrižju.

Both are grammatical, but the original sentence puts the place first.

Also, je is a clitic, and clitics in Croatian often appear in the second position of the clause. That is why it comes right after Na raskrižju.

Gužva can mean several related things:

• crowd
• rush
• traffic jam
• congestion
• a lot of people / cars packed together

In this sentence, because the setting is an intersection, gužva most naturally means heavy traffic or traffic congestion.

So velika gužva is literally a big crowd/jam, but in natural English here it would be heavy traffic.

Because the adjective has to agree with the noun in gender, number, and case.

• gužva is feminine singular
• so the adjective must also be feminine singular
• therefore: velika gužva

Compare:

• velik problem = a big problem masculine
• velika gužva = a big crowd/jam feminine
• veliko selo = a big village neuter

Not exactly. Here pa means something like:

• so
• therefore
• and so
• which is why

So the sentence means:

• There is heavy traffic at the intersection, so we are going on foot.

It links the two ideas with a sense of consequence.

Compare roughly:

• i = and
• ali = but
• pa = so / and therefore / then

Because Croatian usually drops subject pronouns when they are not needed.

The verb form idemo already tells you the subject is we.

• idem = I go / am going
• ideš = you go
• ide = he/she/it goes
• idemo = we go
• idete = you plural/formal go
• idu = they go

So mi is not necessary unless you want emphasis:

• Idemo pješice. = We’re going on foot.
• Mi idemo pješice. = We are the ones going on foot.

Croatian often uses the present tense for a current plan or immediate future, just like English sometimes does.

So idemo pješice can mean:

• we are going on foot
• we’re going to go on foot
• we’re walking

The exact English translation depends on context.

If you wanted a more explicit future, Croatian could also use a future form, but in everyday speech the present tense is very common for planned or immediate actions.

Pješice means on foot or walking, and grammatically it behaves like an adverb.

That means it describes how we are going:

• Idemo pješice. = We are going on foot.

It does not change for gender, number, or case.

Compare:

• Idemo autobusom. = We are going by bus.
• Idemo autom. = We are going by car.
• Idemo pješice. = We are going on foot.

A rough pronunciation guide:

• pješice ≈ PYEH-shee-tseh
• raskrižju ≈ RAHS-kreezh-yoo

A few sound notes:

• pj in pješice starts with a py-like sound
• š sounds like sh
• ž sounds like the s in measure
• j usually sounds like English y

So:

• pješice: pye-shi-tse
• raskrižju: ras-kri-zhyu

Yes. That is a very good way to understand it.

Literally, Croatian says something closer to:

• At the intersection is a big jam/crowd.

But natural English would usually be:

• There is heavy traffic at the intersection.

Croatian often does not need a separate word like English there in there is. The existence idea is simply expressed through the sentence structure and the verb je.

Because pa is connecting two clauses:

• Na raskrižju je velika gužva
• idemo pješice

In Croatian, it is normal to separate such clauses with a comma, especially when the second clause follows as a result or consequence.

So the comma helps show the structure:

• heavy traffic at the intersection, so we’re going on foot.