Η πινακίδα λέει ότι μετά τη στροφή ο δρόμος στενεύει.

Yes. In Greek, λέω (to say) is very commonly used for written text, notices, labels, and signs.

So Η πινακίδα λέει... is a completely natural way to say:

• The sign says...
• The sign reads...

English also does this sometimes, but Greek uses it very naturally and often.

Η πινακίδα means the sign or the signboard.

In this sentence, it most naturally means a road sign or traffic sign.

A few useful related words:

• πινακίδα = sign / signboard / plate
• οδική πινακίδα = road sign
• σήμα can also mean sign, but πινακίδα is especially common for a physical posted sign

So here η πινακίδα is the actual roadside sign.

Ότι means that and introduces a content clause.

So:

• Η πινακίδα λέει ότι... = The sign says that...

In English, that is often optional:

• The sign says the road narrows...

In Greek, ότι is very normal and clear here.

Note:

• ότι = that
• ό,τι = whatever

They are different words, even though they sound the same in modern Greek.

Because μετά here is followed by the accusative case.

The basic dictionary form is:

• η στροφή = the turn

But after μετά meaning after, it becomes accusative:

• τη στροφή = the turn

So:

• μετά τη στροφή = after the turn

This is a very common pattern:

• μετά το φαγητό = after the meal
• μετά τη δουλειά = after work
• μετά την ταινία = after the movie

Both are connected to the feminine accusative singular article.

The full form is την, but before many consonants in everyday speech and writing, the final -ν may be dropped:

• την στροφή
• τη στροφή

Both are possible, but τη στροφή is very common and natural.

Very roughly:

• την is more often kept before vowels and certain consonants
• before other consonants, dropping the -ν is common

So μετά τη στροφή is perfectly normal.

Because μετά meaning after takes the accusative in Modern Greek.

So:

• η στροφή = nominative
• τη στροφή = accusative

That is why the sentence has:

• μετά τη στροφή

Older Greek and some fixed expressions may show other case patterns historically, but for normal Modern Greek usage, learners should remember:

• μετά + accusative = after

Because ο δρόμος is the subject of στενεύει.

The road is the thing doing the action/state-change:

• ο δρόμος στενεύει = the road narrows

Since it is the subject, it stays in the nominative:

• ο δρόμος = the road

If it were a direct object, then you would expect τον δρόμο.

Στενεύει is the 3rd person singular present tense of στενεύω.

So:

• στενεύω = I narrow / I make narrower / I become narrow, depending on context
• στενεύει = it narrows / is narrowing / becomes narrower

Here the subject is ο δρόμος, so:

• ο δρόμος στενεύει = the road narrows = the road becomes narrower

In road-sign language, this often describes what happens ahead.

Because Greek often uses the present tense for things that are about to happen, regularly happen, or are generally true in a given situation.

A road sign is not really telling a story in past or future time; it is stating a condition of the road:

• after the turn, the road narrows

This is similar to English road-sign style, where present tense is also common:

• Road narrows
• Bridge ends
• Lane merges

So Greek does not need a future form like θα στενέψει here.

That word order is very natural in Greek.

Greek word order is more flexible than English, and the phrase placed first often sets the scene:

• μετά τη στροφή = after the turn

Then the main statement follows:

• ο δρόμος στενεύει = the road narrows

So the sentence structure is roughly:

• The sign says that, after the turn, the road narrows.

You could also hear or see:

• Η πινακίδα λέει ότι ο δρόμος στενεύει μετά τη στροφή.

That would also be grammatical, but the original order sounds very natural because it emphasizes the location in time/space first.

Yes. Στροφή is a flexible word.

Depending on context, it can mean:

• turn
• bend
• curve

In a road context, μετά τη στροφή usually means:

• after the bend
• after the turn

The exact English choice depends on how sharp or gentle the road change is, but the Greek word itself works well for all of these.

Sometimes in informal spoken Greek, speakers may omit ότι after verbs like λέω, especially in fast or casual speech.

But in a clear written sentence like this, ότι is very standard and natural:

• Η πινακίδα λέει ότι...

So for learners, it is best to treat ότι here as the normal form.

Both, really.

Greek often phrases this kind of thing literally:

• The sign says...

But what matters is the message carried by the sign. So the sentence naturally means:

• The sign indicates that after the turn the road narrows.

In other words, λέει may be literally says, but functionally it often means states, reads, or indicates.