The ruling on persisting in the post-prayer dhikr while traveling

Question:
Does the tasbih after the obligatory prayers while traveling have the ruling of voluntary acts, or is there no tasbih after the 'Asr or Zuhr prayer while traveling?

Answer:
The dhikr after prayer is recommended (mustahabb) whether traveling or resident, and in Hajj and otherwise. When one says the taslim from his prayer, he says: "I seek Allah's forgiveness" three times, "O Allah, You are Peace and from You comes peace. Blessed are You, O Owner of Majesty and Honor." This is after every prayer: Zuhr, 'Asr, Maghrib, 'Isha', and Fajr, whether traveling or resident, in Hajj and otherwise, for men and women. When he says the taslim, he says: "I seek Allah's forgiveness, I seek Allah's forgiveness, I seek Allah's forgiveness. O Allah, You are Peace and from You comes peace. Blessed are You, O Owner of Majesty and Honor." Then he says: "There is no god but Allah alone, with no partner. His is the dominion and His is the praise, and He is over all things competent. There is no power and no strength except by Allah. There is no god but Allah, and we worship none but Him. His is the favor, His is the grace, and His is the good praise. There is no god but Allah, sincere to Him in religion, even if the disbelievers dislike it. O Allah, there is no one who can prevent what You have given, and there is no one who can give what You have withheld, and no one of power can benefit You with his power." All of this was said by the Prophet (peace and blessings be upon him) when he said the taslim after Zuhr, 'Asr, Maghrib, 'Isha', and Fajr. It is recommended for him to add after Maghrib and Fajr: "There is no god but Allah alone, with no partner. His is the dominion and His is the praise. He gives life and He causes death, and He is over all things competent," ten times after Maghrib and Fajr, as an addition whether traveling or resident.