Learn Hardcore Spanish (Latin America): En el camino, el navegador del teléfono mostró una alerta sobre otro cruce cerrado. - On the way, the phone’s browser showed an alert about another closed crossing.

en el camino literally means “along the way” or “during the route.” It emphasizes that something happened while you were traveling.
de camino typically means “on the way” in the sense of “I’m already headed somewhere” (e.g., estoy de camino = “I’m on my way”). You wouldn’t use de camino to introduce a clause about something happening during the trip.

Why is navegador del teléfono used instead of navegador de teléfono or just GPS?

Spanish uses navegador to mean “navigator” or “GPS device,” so navegador del teléfono is the standard expression.

del is the contraction of de
- el, indicating possession/association.
navegador de teléfono (without el) sounds unnatural because you need the article to specify “the phone’s navigator.”
You can also say el GPS del teléfono, and it’s widely understood in Latin America.

Why is the verb mostró used instead of avisó or dio?

In software or app contexts, Spanish often uses mostrar (“to show/display”) when an alert appears on the screen.

El navegador del teléfono mostró una alerta = “The phone’s navigator displayed an alert.”
Avisar would focus on notifying a user (el navegador avisó al conductor).
Dar una alerta is less common in UI language than mostrar or enviar.

Why is sobre used in alerta sobre otro cruce cerrado? Could I say de or acerca de?

Sobre is the most common preposition for “about” or “regarding” in this type of message: alerta sobre X = “alert about X.”

Alerta de X also appears and isn’t wrong, but sobre sounds more natural here.
Acerca de (alerta acerca de X) is grammatically correct but more formal and less usual in app notifications.

What does otro cruce cerrado refer to, and is cruce the same as intersección?

Otro cruce cerrado means “another closed crossing/intersection.”
In everyday Latin American Spanish, cruce is the common word for where roads meet.
Intersección is more technical; you would understand both, but cruce is more colloquial.

Why is cruce masculine (el cruce) and not feminine?

In Spanish, nouns have fixed grammatical gender. Cruce happens to be masculine, so you say el cruce. You learn the gender together with the noun; it cannot be changed.

Why is cerrado used instead of cerrar or another form?

Cerrado is the past participle of cerrar used as an adjective meaning “closed.”

Cruce cerrado = “a crossing that is closed.”
Using the infinitive cerrar (“to close”) or a different tense would not convey that “it’s already closed.”

Why are there accent marks on teléfono and mostró, but not on camino or alerta?

Spanish accents indicate where the stress falls when words don’t follow default rules.

Teléfono is an esdrújula word (stress on the third-to-last syllable), so it needs an accent.
Mostró is a pretérito form with stress on the last syllable in a word ending in a vowel, so it also gets an accent.
Camino and alerta follow the standard rule (stress on the penultimate syllable for words ending in a vowel), so no accent is required.