207. When traveling one should say Tefillas Haderech, and learn torah on the way, but not

Shulchan Aruch w/Mishna Brurah 110:4

208. When traveling one should take along food ("just in case"), as well as his Tallis and Tefillin

(if there is even a remote possibility of not returning home the same day).

Shulchan Aruch w/Mishna Brurah 110:4

209. It is preferable to say Tefillas Haderech (Traveller's Prayer) while standing, therefore if one is able to safely stand, (ie. on a bus, or train), one should do so.

Shulchan Aruch w/Mishna Brurah 110:4

210. However, it is not necessary to stop a car to stand for Tefillas Haderech. {The Chazon Ish and the Steipler routinely said Tefillas Haderech while sitting as passengers in a moving car.}

Shulchan Aruch w/Mishna Brurah 110:4, Halichos Shlomo (R' Shlomo Zalman Auerbach) 21:11, Orchos Rabeinu 1:2

211. For the driver, it is best to pull over to the side of the road to say Tefillas Haderech with kavannah, but again, this is not me'akaiv, one is not obligated to do so, and certainly one should not delay his tefillah for this purpose.

Shulchan Aruch w/Mishna Brurah 110:4, see also MB 16:2:10

212. Furthermore, one should not burden his passengers (if any) with an unscheduled stop simply to be able to stand for Tefillas Haderech. {If the driver is unable to concentrate on the road while saying Tefillas Hadrech, he may be yotze with someone else's bracha.} Shulchan Aruch w/Mishna Brurah 110:4, Halichos Shlomo (R' Shlomo Zalman Auerbach) 21:11

213. One need only say Tefillas Haderech once each day, even if one makes stops along the way. Therefore, if one said the tefillah on the car ride to the airport it is not necessary to repeat the tefillah on the airplane. Shulchan Aruch w/Mishna Brurah 110:5

214. However, if one stops at a place with the intention of staying overnight, and then changes his mind and begins traveling again, he would be required to repeat the tefillah.

Shulchan Aruch w/Mishna Brurah 110:5

215. Although the language of Tefillas Haderech refers to dangers relating to "bandits and wild animals", generally irrelevant dangers in our time; the conclusion of the Chazon Ish as well as the overwhelming majority of poskim is that one should say the tefillah, and the modern dangers  (accidents etc.) may be even greater than those of earlier times.

Mishna Brurah 110:7:sk30, Tshuvos V'hanhagos 1:199, Piskei Tshuvos 110:2:14

216. Although some argue that the recitation of Tefillas Haderech in modern times is a sofek chiyuv (doubtful obligation), we rely upon the psak of the Pnei Yehoshua that it is permitted to say the beracha of Tefillas Haderech even M'sofek, because it is simply a Bakoshas Rachamim, (a prayer for mercy). Pnei Yehoshua Mes. Berachos 29a, S'V Chavas Da'as YD:110:20

217. Following the beracha of Tefillas Haderech many have the minhag to add the posuk of "Vayaakov Holach Ledarkoi" (3 times) and "Shir Lama'alos", as printed in many siddurim.

Piskei Tshuvos 110:3:20

218. Many also add the following four (or five) additions which are known by the acronym "Levoyah" (accompaniment), made up of the first letter of each posuk; "lamed", "vov", "yud", and "hey", representing: "Leshuasicho Kivisi Hashem", "Vi'hi Noam", "Yoshev Besaiser" and/or "Yevorechicho Hashem Vyishmirecha", and "Hamalach Hagoel Osi". Piskei Tshuvos 110:3:20

219. If one is required c"v to travel on Shabbos for a matter or Pikuach Nefesh (a life/death emergency) one should say Tefillas Haderech {and we do not say that it is in the category of "personal requests" which we generally refrain from on Shabbos}.

S'V Bet'zail Hachochma 5:41, Piskei Tshuvos 110:3:22

220. When traveling on Tish'ah B'Av one should say Tefillas Haderech, but one does not say any of the additional pesukim or tehillim that normally follows the beracha.

221. If possible one should try to say Tefillas Haderech immediately following the completion of a another Beracha that begins and ends with a "Boruch" such as; "Asher Yotzar", "Al Hamichya", or "Borei Nefoshos", to enhance the beracha of Tefillas Haderech by making it a "Beracha  Hasemucha L'chavartah", (a beracha which is joined with another).

Shulchan Aruch w/Mishnah Brurah 110:6

222. However, one should not delay saying Asher Yotzar simply to save it for when he will say Tefillas Haderech. Likewise, if one does not have food to eat to lead into a Beracha Achronah, one should nevertheless say Tefillas Haderech timely, even without another Beracha preceding it. Shulchan Aruch w/Mishna Brurah 110:6, 165:1:sk2, Orchos Rabbeinu 1:61

223. One only says Tefillas Haderech if he will be traveling beyond the city limits a distance of at least One Parsah, which is 8000 Amos, (appx. 2.5 miles, or 4 kilometers).

Shulchan Aruch w/Mishna Brurah 110:7, Halichos Shlomo 21:7

224. For purposes of the obligation to say Tefillas Haderech "travel" includes all modes of travel, including by foot, animal, boat, train, airplane or otherwise.

Shulchan Aruch w/Mishna Brurah 110:7,see also Igros Moshe OC 2:59

225. The best time to say Tefillas Haderech is in the first Parsah (appx. 2.5 miles, or 4 kilometers) after one has traveled more than 70 Amos (appx. 140 feet) out of the city limits. However, one may also say it, bi'dieved, while still in the city, or later on in the trip, so long as there is still at least one Parsah left to travel. Shulchan Aruch w/Mishna Brurah 110:7

226. When traveling by airplane, the best time to say Tefillas Haderech according to Rav Shlomo Zalman Auerbach is just as the plane is taxiing, about to lift off the ground, while others poskim rule to say it just as the plane has lifted off. Piskei Tshuvos 110:8:74

227. If one has stayed overnight in a hotel or other lodging, and is now continuing his trip the next day, he need not wait to leave the city limits to say Tefillas Haderech. Rather, he should say it right away upon beginning his travel that day, as long as he will travel at least One Parsa (appx. 2.5 miles or 4 kilometers) that day. Shulchan Aruch w/Mishna Brurah 110:7

228. Anytime one is traveling in an area or to a place where there is Chazakah of Sakanah (a  specific known danger), one should say Tefillas Haderech without regard to distances traveled or measurements of the city limits. Shulchan Aruch w/Mishna Brurah 110:7