אורח חיים ק״יOrach Chayim 110

Se’if 1א׳

בִּשְׁעַת הַדַּחַק, כְּגוֹן שֶׁהוּא בַּדֶּרֶךְ; אוֹ שֶׁהָיָה עוֹמֵד בְּמָקוֹם שֶׁהוּא טָרוּד וְיָרֵא שֶׁיַּפְסִיקוּהוּ; אוֹ שֶׁלֹּא יוּכַל לְהִתְפַּלֵּל בְּכַוָּנָה תְּפִלָּה אֲרֻכָּה, מִתְפַּלֵּל אַחַר ג' רִאשׁוֹנוֹת: הֲבִינֵנוּ, וְאוֹמֵר אַחֲרֶיהָ ג' אַחֲרוֹנוֹת, וְצָרִיךְ לְאָמְרָם מְעֻמָּד; וּכְשֶׁיַּגִּיעַ לְבֵיתוֹ, אֵין צָרִיךְ לַחֲזֹר וּלְהִתְפַּלֵּל. וְאֵינוֹ מִתְפַּלֵּל הֲבִינֵנוּ בִּימוֹת הַגְּשָׁמִים, וְלֹא בְּמוֹצָאֵי שַׁבָּת וְיוֹם טוֹב.

The Traveler and Laborers - What Should They Pray? And the Order of the Prayer During Travel and of the Study Hall. Containing 8 Seifim: In a extenuating circumstance, such as when one is on the road or when one was standing in a place where one is distracted, and one fears that they will interrupt one, or if one is not able to pray the full [Amidah] prayer with intention - one prays "Havineinu" [i.e. the digest version of the middle 13 Amidah blessings] after the first three [blessings of the Amidah] and, after it, say the last three [blessings of the Amidah], and it is necessary to say them while standing. And when one arrives at one's house, it is not necessary to go back and pray [again]. And one does not pray "Havineinu" in the rainy season, and not at the departure of Shabbat [i.e. Saturday night] nor a holiday.

Se’if 2ב׳

הַפּוֹעֲלִים שֶׁעוֹשִׂין מְלָאכָה אֵצֶל בַּעַל הַבַּיִת, אִם אֵינוֹ נוֹתֵן לָהֶם שָׂכָר חוּץ מִסְעוּדָתָן, מִתְפַּלְּלִין י"ח, אֲבָל אֵין יוֹרְדִין לִפְנֵי הַתֵּבָה וְאֵין נוֹשְׂאִין כַּפֵּיהֶם; וְאִם נוֹתֵן לָהֶם שָׂכָר, מִתְפַּלְּלִין הֲבִינֵנוּ. וְהָאִדָּנָא, אֵין דֶּרֶךְ לְהַקְפִּיד בְּכָךְ, וּמִסְתָמָא אַדַּעְתָּא דְּהָכֵי מַשְׂכִּירִין אוֹתָם שֶׁיִּתְפַּלְּלוּ י"ח.

The laborers who do their work near the proprietor - if [the proprietor] doesn't give them payment beyond their meals, they pray eighteen [blessings the Amidah], they do not descend before the Ark [i.e. they do not appoint a prayer leader to lead them], and they do not "raise their hands" [i.e. if any of them are Kohanim, they do not recite the Priestly Blessings]. And they are given payment, they pray "Havineinu." And nowadays, it is not the way [of proprietor] to be strict regarding this, and it's assumed that they hired them with the understanding that they will [interrupt their work to] pray the Shemoneh Esrei [i.e. the full Amidah].

Se’if 3ג׳

הַהוֹלֵךְ בִּמְקוֹם גְּדוּדֵי חַיָּה וְלִסְטִים, מִתְפַּלֵּל: צָרְכֵי עַמְּךָ מְרֻבִּים וְכו', וְאֵינוֹ צָרִיךְ לֹא לְג' רִאשׁוֹנוֹת וְלֹא לְג' אַחֲרוֹנוֹת; וּמִתְפַּלֵּל אוֹתָהּ בַּדֶּרֶךְ כְּשֶׁהוּא מְהַלֵּךְ, וְאִם יָכוֹל לַעֲמֹד עוֹמֵד, וּכְשֶׁיַּגִּיעַ לְיִשּׁוּב וְתִתְקָרֵר דַּעְתּוֹ, חוֹזֵר וּמִתְפַּלֵּל תְּפִלַּת י"ח בְּרָכוֹת וְאִם לֹא חָזַר לְהִתְפַּלֵּל, הָוֵי כְּאִלּוּ שָׁכַח לְהִתְפַּלֵּל לְגַמְרֵי, וְנִתְבָּאֵר לְעֵיל סי' ק"ח, (כֵּן מַשְׁמָע בְּבֵית יוֹסֵף).

The one who is walking in a place [where there are] bands of wild animals or robbers prays "The needs of your people are numerous, etc.", and there is no need - not the first three [blessings of the Amidah], and not for the final three. And one may pray this on the road, as one is going, but if one is able to stand, one [should] stand. And when one arrives at a settlement and one's mind has calmed down, one goes back and prays the Eighteen Blessings [i.e. the full Amidah]. (And if one did not go back to pray, it is considered as if one forgot to pray entirely. And this was explained above in Siman 108) (And this is also understood from the Beit Yosef)