Guidare così è pericoloso.

Because in Italian, the infinitive can function like a noun or a general activity, just like driving in English.

So:

• Guidare così è pericoloso = Driving like this is dangerous

Here, guidare does not mean to drive in the sense of a command or a specific action happening right now. It means the activity of driving in general, especially in that manner.

Italian often uses the infinitive this way:

• Fumare è vietato = Smoking is forbidden
• Nuotare fa bene = Swimming is good for you

Così means like this / this way / so. It comes after the infinitive because it modifies the action:

• guidare così = to drive like this

This is a very normal word order in Italian. The adverb usually follows the verb or infinitive it describes.

Compare:

• Parlare così è scortese = Speaking like that is rude
• Mangiare troppo è dannoso = Eating too much is harmful

You could also hear other expressions with a similar meaning, such as:

• Guidare in questo modo è pericoloso
• Guidare in questa maniera è pericoloso

These are a bit more explicit than così.

Because the subject of the sentence is the whole infinitive phrase guidare così, and when an infinitive clause is the subject, Italian normally uses the masculine singular adjective:

• Guidare così è pericoloso
• Fumare è dannoso
• Correre troppo è faticoso

So even though English might think of driving as an abstract activity, Italian does not make the adjective agree with some hidden feminine noun here. The standard form is masculine singular: pericoloso.

Yes, absolutely. That is very natural and means the same thing.

Both are correct:

• Guidare così è pericoloso
• È pericoloso guidare così

The difference is mostly one of focus and style:

• Guidare così è pericoloso puts the activity first.
• È pericoloso guidare così starts with the judgment it is dangerous, which often sounds a little more natural in everyday speech.

Italian often allows both structures.

Yes, in a general sense. The sentence is impersonal and general:

• Guidare così è pericoloso = Driving like this is dangerous

It does not specify who is driving. It could mean:

• dangerous for you
• dangerous for people in general
• dangerous for anyone

If you want to make the subject explicit, you can:

• Guidare così è pericoloso per te = Driving like this is dangerous for you
• È pericoloso per tutti guidare così = It is dangerous for everyone to drive like this

It can often be translated as either like this, like that, or that way, depending on context.

On its own, così is somewhat flexible. It usually refers to a manner that is already clear from the situation:

• maybe someone is speeding
• maybe someone is driving carelessly
• maybe someone is holding a phone while driving

So in real English, you might translate it as:

• Driving like this is dangerous
• Driving like that is dangerous
• Driving that way is dangerous

The exact English choice depends on what is happening.

No. In this sentence, the infinitive stands on its own.

Italian commonly uses the bare infinitive as the subject:

• Dormire è importante = Sleeping is important
• Studiare aiuta = Studying helps
• Guidare così è pericoloso

You do not say:

• Il guidare così è pericoloso in normal usage

In some formal or literary contexts, Italian can use an article before an infinitive, but that is not what you want here.

Not in the same direct structure. The most natural alternatives are:

• Guidare così è pericoloso
• È pericoloso guidare così

You would not normally say:

• Pericoloso è guidare così

That sounds very marked or literary. For normal conversation, stick with the first two versions.

A helpful approximation is:

gwee-DAH-re co-ZEE eh peh-ree-coh-LOH-zoh

A few key points:

• gui- in guidare sounds like gwee
• -dare has stress on DA
• così has stress on the final ì
• è is pronounced like eh
• pericoloso has stress on lo: pe-ri-co-LO-so

So the rhythm is roughly:

gui-DA-re co-ZI è pe-ri-co-LO-so

The accent distinguishes è (is) from e (and).

So:

• è = is
• e = and

This is very important in writing.

Examples:

• Lui è stanco = He is tired
• Pane e formaggio = Bread and cheese

In your sentence, è pericoloso means is dangerous, so the accent is required.

Yes, very easily. The structure stays the same:

• Guidare così è sbagliato = Driving like this is wrong
• Guidare così è rischioso = Driving like this is risky
• Guidare così è da irresponsabili = Driving like this is irresponsible / the kind of thing irresponsible people do

This pattern is very productive in Italian: [infinitive phrase] + è + adjective

It is neutral and completely natural. You can use it in everyday conversation, in warnings, in teaching, or in writing.

The only part that may shift tone slightly is così:

• Guidare così è pericoloso = natural, everyday
• Guidare in questo modo è pericoloso = slightly more explicit, sometimes a bit more formal
• È pericoloso guidare in questa maniera = also natural, a touch more formal depending on context

So the original sentence is standard and very usable.

Yes. Depending on tone and context, it can sound like:

• a neutral statement of fact
• a warning
• mild criticism of someone's behavior

For example, if someone is driving badly and you say:

• Guidare così è pericoloso

it may imply:

• You should stop driving that way
• What you're doing is unsafe

So grammatically it is just a statement, but pragmatically it can function as a warning or reproach.