Die verkeersirkel is besig en die snelheidsperk is laag.

Because there are two separate noun phrases:

• die verkeersirkel
• die snelheidsperk

Afrikaans usually uses the article with each noun phrase, just as English does with the traffic circle and the speed limit.

Also, die is the normal definite article in Afrikaans. It does not change for gender, and it is used for both singular and plural nouns.

Afrikaans commonly writes compound nouns as a single word.

So:

• verkeersirkel = verkeer
  • sirkel
• snelheidsperk = snelheid
  • perk

This is very normal in Afrikaans. English often writes similar ideas as two words, but Afrikaans prefers one combined word for many noun compounds.

That -s- is a linking sound used in some Afrikaans compounds.

It does not usually need to be translated separately. It just helps join the parts of the compound smoothly:

• verkeer
  • sirkel → verkeersirkel
• snelheid
  • perk → snelheidsperk

For learners, the safest approach is often to learn the full compound as a vocabulary item, because the linking letter is not always predictable from English.

Here besig means busy.

In this sentence, is besig means is busy.

A very common Afrikaans pattern is:

• besig met
  • noun
    = busy with something

For example:

• Ek is besig met my werk.
  = I am busy with my work.

But in your sentence, besig stands on its own as a description:

• Die verkeersirkel is besig.

Because the sentence contains two coordinated clauses joined by en:

• Die verkeersirkel is besig
• die snelheidsperk is laag

Each clause needs its own verb, so is appears in both parts.

This works much like English:

• The traffic circle is busy and the speed limit is low.

You generally would not leave out the second is in careful standard Afrikaans here.

Because laag comes after the verb is, where Afrikaans usually uses the basic adjective form:

• Die snelheidsperk is laag.

When an adjective comes before a noun, it often changes form:

• die lae snelheidsperk

So:

• laag = predicate form, after is
• lae = attributive form, before a noun

This is a very common thing to notice in Afrikaans adjectives.

Yes, in this sentence it is very similar to English:

• Die verkeersirkel = subject
• is = verb
• besig = description
• en = and
• die snelheidsperk = subject
• is = verb
• laag = description

So the overall pattern is:

subject + verb + complement + en + subject + verb + complement

Afrikaans word order can become more different from English in longer sentences, especially with subordinate clauses, but this sentence is straightforward.

In this sentence, die is the article the, and it is pronounced roughly like dee.

That is important because English speakers often want to pronounce it like the English word die, but that is not correct here.

So:

• die = dee

A simple learner-friendly guide would be:

• verkeersirkel ≈ fuh-KEER-sir-kel
• besig ≈ BEH-sikh or BESS-ikh
• snelheidsperk ≈ SNEL-haits-perk
• laag ≈ laakh

A few pronunciation notes:

• v in Afrikaans often sounds close to English f
• g is usually a guttural sound, like the ch in Scottish loch
• die is dee

The exact accent will vary a bit by speaker, but those approximations will get you close.

Yes. In this sentence, both words describe the subject:

• besig describes die verkeersirkel
• laag describes die snelheidsperk

They come after is, so they function like predicate adjectives, similar to English:

• is busy
• is low

So even though the sentence is simple, it gives you a useful pattern:

• Die X is Y.

That is a very common Afrikaans sentence structure.