Esta zona es peatonal, así que no pueden entrar coches.

to be

Breakdown of Esta zona es peatonal, así que no pueden entrar coches.

• poder: can
• esta: this
• así que: so

Questions & Answers about Esta zona es peatonal, así que no pueden entrar coches.

What does the adjective in bold, peatonal, mean, and how does it relate to peatón?

Peatón = pedestrian (a person).
Peatonal = pedestrian-only / for pedestrians. It’s an adjective used with nouns: zona peatonal, calle peatonal. Plural: peatonales (e.g., calles peatonales).

Why is it es peatonal with ser, not está peatonal with estar?

Because this is a classification (the area’s inherent type), so Spanish uses ser. Está peatonal is not idiomatic. If you wanted a result-of-action/state idea, you could say está peatonalizada or se ha peatonalizado.

Why Esta without an accent and not Está?

Esta (no accent) is the demonstrative “this,” agreeing with the feminine zona.
Está (with accent) is the verb “is” from estar.
Example contrast: Esta zona vs. La zona está…

What does así que mean here, and is the comma before it correct?

Así que means “so/therefore,” expressing a consequence. A comma before it is standard: …, así que …. You could also use por eso, por lo tanto, por tanto, or de modo que; así que is a bit more informal in tone.