Autobus jedzie na południe.

Word by word:

• autobus = bus
• jedzie = is going / is travelling / is driving
• na południe = south / to the south / southward

So the sentence is literally something like The bus is going south.

Because jechać and iść are used for different kinds of movement in Polish.

• jechać → to go by vehicle or transport
• iść → to go on foot

A bus does not go on foot, so Polish uses jedzie.

Compare:

• Autobus jedzie. = The bus is going.
• Człowiek idzie. = The person is walking / going on foot.

Jedzie is:

• 3rd person singular
• present tense
• from the verb jechać

It agrees with autobus, which is singular.

So:

• ja jadę = I am going
• ty jedziesz = you are going
• on/ona/ono jedzie = he/she/it is going

Here autobus works like it, so jedzie is the correct form.

In this sentence, na południe is a very common Polish expression meaning southward / to the south.

Polish often uses:

• na północ = north
• na południe = south
• na wschód = east
• na zachód = west

So jedzie na południe means is going south.

This is just the normal directional pattern in Polish.

Here na takes the accusative because it shows direction or movement toward something.

So:

• na południe = to the south / southward → directional

The noun południe is neuter, and in this form the nominative and accusative look the same, so you do not see a spelling change.

This is one reason it may look simpler than it really is.

This is a very useful distinction:

• na południe = to the south / southward → movement, direction
• na południu = in the south → location

Examples:

• Autobus jedzie na południe. = The bus is going south.
• To miasto leży na południu Polski. = This city lies in the south of Poland.

So if there is movement, you often get na południe.
If something is located there, you often get na południu.

Yes. Południe can mean both:

• south
• noon

Polish relies on context.

Examples:

• Jest południe. = It is noon.
• Jedziemy na południe. = We are going south.

In Autobus jedzie na południe, the meaning is clearly south, not noon, because of the context and the phrase na południe.

A rough English-friendly guide:

• Autobus ≈ ow-TOH-boos
• jedzie ≈ YE-jyeh
• na ≈ nah
• południe ≈ poh-WOOD-nyeh

A few important sound notes:

• ł sounds like English w
• j sounds like English y
• dzie / dnie have soft sounds that do not match English perfectly

So the whole sentence is roughly:

ow-TOH-boos YE-jyeh nah poh-WOOD-nyeh

Because Polish has no articles.

English says:

• the bus
• a bus

Polish just says:

• autobus

Whether it means a bus or the bus depends on context.
So Autobus jedzie na południe can naturally correspond to The bus is going south.

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

Autobus jedzie na południe is the most neutral, straightforward version.

But other orders are possible for emphasis, for example:

• Na południe jedzie autobus.
  This puts more focus on south or on the direction.

Even so, the basic meaning stays the same.

For a learner, the given order is the best one to use first.

It can do both, depending on context.

Autobus jedzie na południe can mean:

• The bus is going south right now
• The bus goes south as a route or regular movement
• sometimes even a near-future or scheduled sense, depending on context

Polish present tense is often a little broader than English present progressive.

So context tells you whether it is happening now, generally, or as part of a schedule.

Autobus is masculine inanimate.

That matters because adjectives, past tense forms, and some numerals will agree with it.

For this sentence, the main effect is that the verb uses the singular form jedzie, which matches a singular subject.

You could, but it sounds less natural for this simple idea.

• Autobus jedzie na południe = the normal, everyday way to say The bus is going south
• Autobus podróżuje na południe sounds more like The bus is travelling south, which is possible but less basic and less idiomatic here

For a vehicle moving in a direction, jedzie is the natural choice.