Learn Hardcore Turkish: Trafikte yeni güzergahları kullanmak, ulaşım süresini kısaltabilir. - Using new routes in traffic can shorten travel time.

The -te in Trafikte is the locative case ending, which corresponds to “in,” “on,” or “at” in English. So Trafikte literally means “in traffic.”

Why doesn’t yeni take any suffix, while güzergahları does?

In Turkish, adjectives like yeni (“new”) stay unchanged and precede the noun. All case, number, and definiteness markings attach to the noun itself. Here güzergah (“route”) carries plural -lar and accusative -ı, not the adjective.

Why is güzergahları plural and marked with the accusative -ı?

Plural: We’re talking about multiple “new routes,” so güzergah takes -lar.
Accusative: As the direct object of kullanmak (“to use”), güzergahlar gets -ı to indicate a definite or specific set of routes. In English it’s like saying “using the new routes” rather than “using new routes” in a purely general sense.

Why is kullanmak in the infinitive form at the beginning of the sentence?

Turkish uses the infinitive (-mak/-mek) to create noun-like clauses. Trafikte yeni güzergahları kullanmak functions as the subject of the sentence—equivalent to the English gerund “Using new routes in traffic.” The infinitive clause stands in for “the act of using” those routes.