Heldigvis skete der ingen ulykke, selvom trafikken var meget tæt i morges.

This is because Danish is a V2 language in main clauses. That means the finite verb usually comes in the second position, no matter what comes first.

So in:

Heldigvis skete der ingen ulykke

• Heldigvis = first element
• skete = finite verb, so it must come second
• der comes after the verb

If you started with the subject-like element instead, you could also say:

Der skete heldigvis ingen ulykke.

Both are grammatical, but the original sentence puts extra focus on fortunately.

Here der is an expletive or dummy subject. It does not really mean there in a physical location sense.

In Danish, verbs like ske (to happen) often use der when introducing the existence or occurrence of something:

• Der skete en fejl. = An error happened / There was an error.
• Der kom en mand ind. = A man came in.

So:

skete der ingen ulykke
literally looks like
happened there no accident,
but the real function is closer to
no accident happened.

English does something similar with there in sentences like There was a problem.

Skete is the past tense of ske, which means to happen.

Main forms:

• at ske = to happen
• sker = happens / is happening
• skete = happened
• er sket = has happened

So:

• Der sker ingenting. = Nothing is happening.
• Der skete en ulykke. = An accident happened.
• Det er sket før. = It has happened before.

Ingen is used to mean no / none / not any before a noun.

So:

• ingen ulykke = no accident
• ingen biler = no cars
• ingen problemer = no problems

You generally use ikke to negate verbs, adjectives, or whole statements:

• Trafikken var ikke tæt. = The traffic was not heavy.
• Han kom ikke. = He did not come.

So in this sentence, because the negation applies directly to the noun ulykke, Danish uses ingen, not ikke.

Because the sentence means no accident in the singular, not no accidents in general.

Compare:

• Der skete ingen ulykke. = No accident happened.
• Der skete ingen ulykker. = No accidents happened.

Both are possible, but they are slightly different in focus:

• ingen ulykke sounds like not a single accident occurred
• ingen ulykker emphasizes the absence of accidents in plural

In context, the singular is very natural.

After ingen, Danish normally uses the indefinite noun form:

• ingen ulykke
• ingen bil
• ingen problemer

You would not usually say ingen ulykken.

That is because ingen already works like a determiner, similar to no in English, and determiners normally combine with the indefinite noun form.

Selvom means although / even though and introduces a subordinate clause.

In the sentence:

selvom trafikken var meget tæt i morges

the part after selvom is dependent on the main clause. It gives a contrast:

• Main clause: fortunately no accident happened
• Subordinate clause: even though traffic was very heavy this morning

So selvom is a conjunction used to connect a contrasting idea.

Because subordinate clauses in Danish do not follow the same V2 rule as main clauses.

In a main clause, the finite verb is usually in second position:

• Trafikken var meget tæt.

But in a subordinate clause introduced by selvom, the normal order is:

• conjunction + subject + verb + other elements

So:

• selvom trafikken var meget tæt
• not selvom var trafikken meget tæt

This difference between main clause word order and subordinate clause word order is very important in Danish.

In standard Danish spelling, a subordinate clause is commonly separated with a comma.

So:

Heldigvis skete der ingen ulykke, selvom trafikken var meget tæt i morges.

The comma marks the beginning of the subordinate clause introduced by selvom.

Danish comma rules can be a little tricky because there are different traditions, but with a clause like this, the comma is very normal and expected.

Trafikken is the definite form, meaning the traffic.

• trafik = traffic
• trafikken = the traffic

In this sentence, the speaker is referring to the specific traffic situation that morning, so the definite form is natural:

trafikken var meget tæt i morges
= the traffic was very heavy this morning

Danish often uses the definite form where English also uses the.

It does literally mean something like close, dense, or tight, but in traffic contexts it means heavy, dense, or congested.

So:

• tæt trafik = heavy traffic
• trafikken var tæt = the traffic was heavy

This is a good example of a word whose basic meaning extends naturally into a specific context.

Yes, meget tæt is completely natural.

• meget = very
• tæt = dense / heavy

So:

trafikken var meget tæt
= the traffic was very heavy

You might also hear expressions like:

• der var meget trafik = there was a lot of traffic
• trafikken var tæt = the traffic was heavy
• trafikken var meget tæt = the traffic was very heavy

All are natural, but they focus slightly differently.

I morges means this morning or earlier this morning, referring to the morning of the current day.

Examples:

• Jeg så ham i morges. = I saw him this morning.
• Det regnede i morges. = It rained this morning.

By contrast:

• om morgenen = in the morning / in the mornings

This is more general or habitual:

• Jeg drikker kaffe om morgenen. = I drink coffee in the morning.
• Hun arbejder bedst om morgenen. = She works best in the morning.

So in your sentence, i morges is used because it refers to one specific morning.

Yes, absolutely.

Compare:

• Heldigvis skete der ingen ulykke...
• Der skete heldigvis ingen ulykke...

Both are correct. The difference is mainly one of focus:

• Heldigvis first: stronger emphasis on the speaker’s relief
• Der first: a bit more neutral, with heldigvis added later

Because Danish main clauses are V2, whichever element comes first is often the one you want to highlight.

Ulykke often means accident, especially in everyday contexts like traffic, work, or injuries.

But it can also mean misfortune in some contexts.

For example:

• en trafikulykke = a traffic accident
• en arbejdsulykke = a workplace accident
• en stor ulykke can sometimes mean a major disaster or tragedy

In this sentence, because of the mention of traffic, accident is clearly the intended meaning.

A rough literal breakdown would be:

• Heldigvis = fortunately
• skete = happened
• der = there / dummy subject
• ingen ulykke = no accident
• selvom = although / even though
• trafikken = the traffic
• var = was
• meget tæt = very dense / very heavy
• i morges = this morning

So a very literal version might look like:

Fortunately happened there no accident, although the traffic was very heavy this morning.

That is not natural English, but it helps show how the Danish sentence is built.