Is it permissible to perform the traveler's prayer after setting out on a journey, and is it true that prayer is not permissible after Witr and before Fajr, and what are the supplications and surahs recommended to recite before traveling?

The intention behind the maternal uncle's two rak'ahs of prayer before his journey is unclear. If he is shortening the prayer before embarking on the journey, then it is not permissible. If he is performing two specific rak'ahs for travel, we know of no evidence for this, except for the two rak'ahs of Istikhara. As for praying after Witr and before Fajr, it is permissible for someone who has a sudden intention to perform voluntary prayer, and he does not repeat Witr. However, it should not be made a habit. Some jurists have made an exception for the traveler regarding the recommendation to avoid voluntary prayers after Witr.