The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, said: "There is no harm if a person, when praying alone without an imam, suffices with the iqamah and leaves out the adhan in three prayers: Dhuhr, ‘Asr, and ‘Ishaʾ al-Akhirah. But he should not leave out the adhan and the iqamah in Maghrib and Fajr, for these are two prayers that are not shortened during travel." This has already been mentioned in the two previously cited hadiths, and it is further affirmed by what has been narrated: