Si no frenamos a tiempo, podemos chocar con el coche de delante.

Because after si for a real, possible condition, Spanish normally uses the present indicative, not the subjunctive.

So:

• Si no frenamos a tiempo, podemos chocar... = If we don’t brake in time, we can/may crash...

Compare:

• Si llueve, no salimos. = If it rains, we’re not going out.

The subjunctive is not normally used directly after this kind of si.

Frenamos comes from frenar, meaning to brake.

Here, frenamos is:

• 1st person plural
• present tense
• meaning we brake or we do not brake, depending on the sentence

In Si no frenamos a tiempo, it means:

• if we don’t brake in time

Because Spanish often leaves out subject pronouns when they are not needed.

The verb ending -amos already tells you the subject is we.

So:

• frenamos = we brake
• podemos = we can / we may

Adding nosotros is possible, but it usually adds emphasis or contrast:

• Si no frenamos a tiempo, podemos chocar...
• Si nosotros no frenamos a tiempo... = more emphatic

A tiempo means in time or early enough.

So:

• frenar a tiempo = to brake in time

It is a very common expression in Spanish:

• Llegamos a tiempo. = We arrived in time.
• No reaccionó a tiempo. = He/She didn’t react in time.

Because after poder, the next verb goes in the infinitive with no extra preposition.

Structure:

• poder + infinitive

So:

• podemos chocar = we can/may crash
• puedo ir = I can go
• pueden venir = they can come

Spanish does not say:

• podemos a chocar

It can suggest can, may, or might, depending on context.

In this sentence, podemos chocar means something like:

• we could crash
• we might crash
• we may crash

It expresses possibility rather than ability.

Because chocar con means to crash into / collide with.

Examples:

• Chocó con un árbol. = He/She crashed into a tree.
• No quiero chocar con nadie. = I don’t want to bump into anyone / crash into anyone.

So here:

• chocar con el coche de delante = to crash into the car in front

Literally, it means the car in front or more literally the car from in front.

In natural English, we would usually say:

• the car in front
• the car ahead

Spanish often uses:

• delante = in front
• de delante after a noun to describe something as the one in front

Because delante by itself is usually an adverb:

• Está delante. = It is in front.

But after a noun, Spanish often uses de + delante to mean the one in front:

• el coche de delante = the car in front
• la fila de delante = the row in front

So de delante works like a descriptive phrase attached to the noun.

In standard Spanish, especially for learners, el coche de delante is the safer and more natural choice in this meaning.

El coche delante may sound incomplete or less natural in many contexts. Spanish usually prefers:

• el coche de delante = the car in front
• el coche que va delante = the car that is ahead/in front

Because Spanish usually uses an article where English also would, and here it refers to a specific car:

• the car in front

So:

• el coche de delante = the car in front

If you said:

• un coche de delante that would mean:
• a car in front / one of the cars ahead

Yes. In Spain, coche is the normal word for car.

In much of Latin America, people often say:

• carro
• auto
• automóvil

So in Spain:

• el coche de delante

In other regions, you might hear:

• el carro de adelante
• el auto de adelante

They are related, but not always interchangeable.

• delante = in front
• adelante can mean forward, ahead, go ahead, or sometimes in front, depending on context

In this sentence, de delante is the natural expression for the one in front.

So:

• el coche de delante = natural
• el coche de adelante is more common in many Latin American varieties than in Spain

For Spain Spanish, de delante fits very well.

Because the sentence begins with a conditional clause:

• Si no frenamos a tiempo, ...

In Spanish, when this kind of clause comes first, it is normal to separate it with a comma.

So:

• Si no frenamos a tiempo, podemos chocar...

If the order is reversed, the comma is often not used:

• Podemos chocar con el coche de delante si no frenamos a tiempo.

Not exactly. Frenar means to brake, not necessarily to stop completely.

So the more accurate meaning is:

• If we don’t brake in time...

If you wanted stop, Spanish would more likely use:

• parar
• detenerse

That said, in some contexts, an English speaker might naturally say stop in time, but the Spanish verb here is specifically about braking.

Yes, but the meaning changes.

• Si no frenamos a tiempo, podemos chocar... = If we don’t brake in time, we might/could crash...
• Si no frenamos a tiempo, chocamos... = If we don’t brake in time, we crash...

The version with podemos sounds less certain and more like a warning about a possible result.
The version without podemos sounds more direct and definite.

It is talking about a real or possible situation, not an unreal one.

That is why it uses:

• si + present
• present tense in the main clause

Structure:

• Si no frenamos a tiempo, podemos chocar...

If it were a more hypothetical or unlikely situation, Spanish would usually use a different pattern, such as:

• Si no frenáramos a tiempo, podríamos chocar... = If we didn’t brake in time, we could crash...

That version sounds more hypothetical.