I og med at flugtvejen er fri, når alle nødudgangen.

It is a fixed expression meaning since, seeing that, or given that. It introduces the reason or background for the main clause.

In this sentence, i og med at flugtvejen er fri means something like since the escape route is clear.

This expression is often a bit more formal or explanatory than everyday fordi.

No. Here it is just i, the preposition, written with a capital letter because it is at the beginning of the sentence.

So I og med at is one set phrase. It does not mean the pronoun you.

Not very usefully. Even though the words individually are simple, the whole expression works as an idiomatic conjunction.

So it is better to learn i og med at as one chunk meaning since / given that, rather than trying to build the meaning word by word.

Because the sentence begins with a subordinate clause:

I og med at flugtvejen er fri

After that comes the main clause:

når alle nødudgangen

In Danish, a subordinate clause is separated from the main clause by a comma, so the comma appears right where the first clause ends.

This is because Danish main clauses normally follow the V2 rule: the finite verb comes in the second position.

If the main clause stood alone, it would be:

Alle når nødudgangen.

But when another element comes first in the sentence — here the whole subordinate clause I og med at flugtvejen er fri — that first element takes the first slot. Then the finite verb of the main clause must come next:

I og med at flugtvejen er fri, når alle nødudgangen.

So the subject alle moves after the verb.

No. Here når is the verb at nå, which means to reach, to get to, or to manage to reach.

That is why it is followed by an object:

nødudgangen = the emergency exit

So here når alle nødudgangen means everyone reaches the emergency exit.

This can be confusing because Danish also has når as a conjunction meaning when, but that is a different word function even though the spelling is the same.

Because Danish usually puts the definite article at the end of the noun as a suffix.

So:

• flugtvej = escape route
• flugtvejen = the escape route

and:

• nødudgang = emergency exit
• nødudgangen = the emergency exit

This is very normal in Danish. English uses a separate word (the), but Danish often adds -en, -et, or another ending to the noun itself.

Because flugtvej is a common-gender singular noun, and predicate adjectives agree with that.

So:

• en flugtvej → fri
• et område → frit
• plural/definite contexts often give frie

Here flugtvejen is singular and common gender, so fri is the correct form.

Here fri means clear, unblocked, or open for passage.

It does not mean free in the sense of costing nothing. In safety-related language, en fri flugtvej means an escape route that is not obstructed.

Here alle means everyone or all people.

In other contexts, alle can also mean all depending on what it refers to, but in this sentence it clearly refers to people reaching the emergency exit.

Also, Danish verbs do not change form for singular and plural the way English verbs sometimes do, so når stays the same with alle.

They are related, but they are not the same thing.

• flugtvej = escape route
  the path or route people use to get out safely

• nødudgang = emergency exit
  the actual exit/door used in an emergency

So the sentence says that because the escape route is clear, everyone reaches the emergency exit.

Danish often uses the present tense for general truths, standard procedures, or expected results.

So er and når do not have to mean only right now at this exact moment. The sentence can express a general idea such as:

If / when the escape route is clear, everyone reaches the emergency exit.

That use of the present tense is very normal in Danish.