El camino al aeropuerto tiene mucho tráfico hoy.

Because a + el contracts to al in Spanish.

So:

• a el aeropuerto → al aeropuerto

This contraction is mandatory with el (but not with la):

• Voy al aeropuerto
• Voy a la estación

Here, al aeropuerto means to the airport.

Literally, it means the road/path to the airport or the way to the airport.

A native English speaker may expect something more like the road to the airport, and that is basically the idea here. In Spanish, camino can mean:

• path
• road
• way

Depending on context, it can sound more general than English road.

Spanish often uses tener in expressions where English might use there is or another structure.

So tiene mucho tráfico literally looks like has a lot of traffic, and that is normal Spanish.

Spanish commonly says things like:

• Esta calle tiene mucho tráfico
• La ciudad tiene mucho tráfico

English often prefers:

• There is a lot of traffic on this road
• This road is very busy

But in Spanish, tener mucho tráfico is perfectly natural.

Because mucho means a lot of / much, while muy means very.

Here, tráfico is a noun, so you need mucho:

• mucho tráfico = a lot of traffic

You use muy with adjectives or adverbs:

• muy rápido
• muy lento
• muy lejos

So:

• mucho tráfico ✅
• muy tráfico ❌

Because tráfico is usually treated as an uncountable noun here, like traffic in English.

You do not normally count separate traffics. You talk about:

• mucho tráfico
• poco tráfico

not:

• muchos tráficos ❌

So Spanish works very similarly to English in this case.

Spanish often uses the definite article more than English does.

El camino means the road/path/the way. In many contexts, Spanish prefers to name the thing directly with the article, even where English might say something slightly different.

Without the article, camino would usually sound less natural here unless the sentence were restructured.

So El camino al aeropuerto... is the normal way to say The road to the airport...

Camino is understandable, but in many real-life situations in Spain, carretera might sound more natural if you mean an actual road used by cars.

Compare:

• El camino al aeropuerto = the way/road/path to the airport
• La carretera al aeropuerto = the road/highway to the airport

If you are talking about vehicle traffic, many speakers might naturally say:

• La carretera del aeropuerto tiene mucho tráfico hoy
• La carretera al aeropuerto tiene mucho tráfico hoy

So camino is possible, but depending on context, carretera may sound more idiomatic.

Spanish allows adverbs of time like hoy to move around fairly freely.

So these are all possible:

• El camino al aeropuerto tiene mucho tráfico hoy
• Hoy el camino al aeropuerto tiene mucho tráfico
• El camino al aeropuerto hoy tiene mucho tráfico

The version with hoy at the end sounds very natural and neutral. Putting hoy earlier can give it a little more emphasis.

Yes, that is grammatically possible, but it is a slightly different structure.

Compare:

• El camino al aeropuerto tiene mucho tráfico hoy
  Focuses on the road as the subject.

• Hay mucho tráfico en el camino al aeropuerto hoy
  Focuses on the existence of traffic.

Also, many speakers would prefer en la carretera al aeropuerto rather than en el camino al aeropuerto if talking about car traffic.

A very natural alternative would be:

• Hoy hay mucho tráfico en la carretera al aeropuerto

Because the sentence is not describing the road with an adjective. It is saying that the road has a lot of traffic.

So Spanish uses:

• tiene mucho tráfico = has a lot of traffic

If you wanted to use estar, you would need a different expression, for example:

• Está muy transitado = It is very busy

So both are possible ideas, but the grammar changes:

• El camino al aeropuerto tiene mucho tráfico hoy
• El camino al aeropuerto está muy transitado hoy

It is in the simple present: tiene.

In Spanish, the present tense can cover:

• a current situation
• a general fact
• something true for today or around now

So here it means something like:

• The road to the airport has a lot of traffic today
• There’s a lot of traffic on the road to the airport today

It does not necessarily mean only this exact second. It refers naturally to the situation today.

In standard Spain Spanish, aeropuerto is pronounced approximately:

ah-eh-roo-PAIR-toh

A few pronunciation notes:

• ae is pronounced as two vowels together, not like English air
• r in the middle is a light flap
• puer has a strong stress on -puer-
• to is a clean Spanish to, not an English diphthong

The stress falls on puer:

• ae-ro-PUER-to

Here it means to the airport.

That is because a usually indicates direction or destination in this kind of phrase:

• camino al aeropuerto = road/path to the airport

If you wanted at the airport, you would normally use:

• en el aeropuerto = at the airport

So:

• al aeropuerto = to the airport
• en el aeropuerto = at the airport

Yes, but the meaning changes.

• al aeropuerto = to the airport
• del aeropuerto = of/from the airport

So:

• El camino al aeropuerto = the road to the airport
• El camino del aeropuerto could suggest the road belonging to, coming from, or associated with the airport

If your idea is destination, al aeropuerto is the right choice.