Sheikh Salman al-Oadah
Scholars agree that a traveler is allowed to fast if he wishes to, just as he is permitted to break his fast. However, it is preferable for him to do what is easiest for him.
If breaking his fast is easier for him, then that is what is preferred. If it is easier for him to continue fasting until sunset, and if he wishes to fast along with everyone else and not have to make up the day later, then that is what is preferred.
The option for the traveler to break the fast is a concession to make things easy. Allah says: "Whoever of you is present in the month shall fast therein, and whoever is sick or upon a journey, then (he shall fast) a (like) number of other days; Allah desires ease for you, and He does not desire for you difficulty." [Sûrah al-Baqarah: 185]
And Allah knows best.
Source: Islam Today