The Best in Travel and Shortening: Leaving the Voluntary Prayers

The questioner says in part of this question: Which is better: if one prays the resident prayer in travel with the voluntary and recommended prayers, and he has a desire for that, or the shortened prayer? Please inform us?
Answer: In residence, one prays the resident prayer, praying four rak'ahs.
The presenter: He says: Which is better if one prays the resident prayer in travel?
The Shaykh: No, in travel it is better to pray the travel prayer, two by two in the midday, afternoon, and night prayers, not four. So the best is to shorten the prayer, praying two by two. This is the best in travel, and this is the Sunnah.
The presenter: He says: with the voluntary and recommended prayers. I believe he means with the voluntary prayers, referring to the regular voluntary prayers and the recommended ones.
The Shaykh: No, the best is to leave them... in travel, leaving the regular voluntary prayers. One prays only two. The Prophet (peace and blessings be upon him) used to pray only two and did not pray the regular voluntary prayers with them, neither before nor after, in travel, meaning, except for the Sunnah of Fajr. If he was able, he would pray it in travel. Likewise, the Witr. If he was able, he would pray Witr with one rak'ah, or three rak'ahs, or more than that, in odd numbers, at night after the night prayer until the appearance of dawn. This is the time for Witr.
The presenter: Okay, and regarding the recommended prayers other than the regular voluntary ones?
The Shaykh: If he prays, if he has the opportunity to pray the Duha prayer... the Tahajjud at night, all of it is good, do not leave it. He prays Tahajjud at night. And if he has the opportunity for Duha, he prays it, there is no harm, even in travel.