מִי שֶׁאֵינוֹ יָכוֹל לְכַוֵּן הָרוּחוֹת, יְכַוֵּן לִבּוֹ לְאָבִיו שֶׁבַּשָּׁמַיִם.
If he does not know the direction in which to pray, he should direct his heart to his Father in Heaven.
On this the Biur Halocho says
“It seems that it is good for him to turn his face to one of the other directions.”
What is the point of the comment of the Biur Halocho?
The only thought I had was that by turning away from his direction of travel he might think less about travelling and more about his prayer.