Authentic Supplication Number 194.

It is reported by way of Abi Hurayrata , that a man said: O' Messenger of Allah: I want to go on a journey, so advise me. He said: "You should take shield from the anger of Allah [Taqwa might also be translated as "be pious" or "be watchful of Allah"], and magnify Allah [Takbeer is to say: 'Allahu 'akbaru  ] upon every elevation." After the man left, he said: 'Allahumma 'itwi lahul-bu`da wa hawwin `alayhi 'as-safara (208).

Footnotes.
(208) O' my ilah fold the distance for him, and facilitate the journey upon him.

Reporters.
At-Tirmithi said it was comely. Al-Albani agreed, and mentioned that Ibn Hibban (#2378, 2379) also reported it, and that Al-Hakim (#98/2) said it was sound. Al-Albani included this hadeeth in The Authentic of Good Sayings as #137.