Mi madre suele suspirar cuando ve tanto tráfico en la autopista.

Suele comes from the verb soler, which is used to talk about something that happens usually, habitually, or tends to happen.

So Mi madre suele suspirar means something like:

• My mother usually sighs
• My mother tends to sigh

A useful pattern is:

• soler + infinitive

For example:

• Suelo leer por la noche = I usually read at night
• Suelen llegar tarde = They usually arrive late

Because after soler, Spanish uses the infinitive.

So the structure is:

• suele + suspirar
• not suele + suspira

This is similar to English patterns like:

• wants to eat
• tends to complain
• usually sighs

In Spanish, soler is the conjugated verb, and the second verb stays in the infinitive:

• suelo estudiar
• sueles salir
• suele suspirar

Because ver and mirar are not the same.

• ver = to see
• mirar = to look at / to watch

In this sentence, the idea is that she sees a lot of traffic, not that she intentionally looks at it.

So:

• cuando ve tanto tráfico = when she sees so much traffic

Also, ve is the third-person singular form of ver:

• yo veo
• tú ves
• él/ella ve

Because tanto is used with nouns, while tan is used with adjectives or adverbs.

Here, tráfico is a noun, so Spanish uses:

• tanto tráfico = so much traffic

Compare:

• Hay tanto tráfico = There is so much traffic
• Es tan difícil = It is so difficult
• Conduce tan rápido = He drives so fast

So:

• tanto + noun
• tan + adjective/adverb

Both are possible, but they are slightly different in feel.

• mucho tráfico = a lot of traffic
• tanto tráfico = so much traffic

In this sentence, tanto adds a stronger emotional sense, which fits well with suspirar. It suggests that the amount of traffic feels excessive or frustrating.

So cuando ve tanto tráfico sounds a bit more like:

• when she sees so much traffic

rather than just:

• when she sees a lot of traffic

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

You normally do not count individual traffics. Instead, you talk about the amount of traffic:

• mucho tráfico
• poco tráfico
• demasiado tráfico
• tanto tráfico

So the singular is normal here.

In Spanish, en is commonly used for location, including being on a road or motorway.

So:

• en la autopista = on the motorway / on the highway

Even though English often says on the motorway, Spanish uses en here.

A few similar examples:

• en la calle = in/on the street
• en la carretera = on the road
• en la autopista = on the motorway

In Spain, autopista usually refers to a motorway-type road. You may also hear autovía, which is another very common Spanish road term.

Because this sentence describes a habitual, repeated situation, so the indicative is used:

• cuando ve tanto tráfico = when she sees so much traffic

The subjunctive vea would usually be used when talking about a future or uncertain event:

• Cuando vea tanto tráfico, suspirará = When she sees that much traffic, she will sigh

So the difference is roughly:

• cuando + indicative = repeated, usual, real situation
• cuando + subjunctive = future or not-yet-real situation

Yes, Spanish often leaves out the subject when it is clear from the verb or context.

So in context, you could say simply:

• Suele suspirar cuando ve tanto tráfico en la autopista

However, using Mi madre is very natural because it:

• introduces who you are talking about
• makes the sentence clearer
• can add a little emphasis

Spanish often omits subject pronouns like ella, but noun subjects like mi madre are commonly stated when needed.

Yes, Spanish word order is fairly flexible.

The original sentence is completely natural:

• Mi madre suele suspirar cuando ve tanto tráfico en la autopista

But you could also say:

• Cuando ve tanto tráfico en la autopista, mi madre suele suspirar

This version puts the time clause first. The meaning stays the same.

The original order is probably the most neutral and straightforward.

Yes, mainly in tone and regional preference.

• mi madre = my mother
• mi mamá = my mum / my mom

In Spain, mamá is very common in everyday speech when talking directly to your mother or speaking more warmly/familiarly. Madre can sound a bit more neutral or descriptive.

So this sentence with Mi madre sounds perfectly natural, but Mi mamá suele suspirar... would also be possible in a more personal, family-style tone.

Yes. In many cases, natural English would just use the simple present:

• My mother sighs when she sees so much traffic on the motorway

That already sounds habitual in English.

Spanish often makes the habitual meaning more explicit with soler, while English may or may not use usually or tends to.

So all of these can work as translations depending on style:

• My mother usually sighs...
• My mother tends to sigh...
• My mother sighs...