"I travel" and "voyage" are English equivalent of the Italian word viaggio. Context makes clear whether the same-spelled word serves as the first person singular present indicative (case 1) or a masculine singular noun (example 2). The pronunciation will be "VYAD-djo" in Italian.
"Journey" in English is viaggio in Italian.
Buon viaggio Viaggio felice
bel viaggio
"How was your trip?" in English means Come è stato il tuo viaggio? in Italian.
viaggio all'Italia in luglio
"In transit" is an English equivalent of the Italian phrase in viaggio. The prepositional phrase also translates literally as "on the road" and "traveling" according to English contexts. The pronunciation will be "een VYAD-djo" in Pisan Italian.
Buon viaggio miei amici.
ciao sorelle di viaggio
"Beautiful trip with your love"! in English is Bel viaggio col tuo amore! in Italian.
Addio, ti auguro un viaggio sicuro!
"One-way trip" is an English equivalent of the Italian phrase viaggio singolo. The pronunciation of the masculine singular phrase -- which literally means "single trip," "single voyage" -- will be "VYAD-djo SEEN-go-lo" in Italian.
Buon viaggio! is an Italian equivalent of the English phrase "Happy traveling!" The masculine singular phrase translates literally as "Good voyage!" in English. The pronunciation will be "bwon VYAD-djo" in Pisan Italian.