http://revach.net/article.php?id=2929

Section: Halacha   Category: Tshuvos
B'Tzel HaChochma: Passing Someone Davening Shemoneh Esrei In Middle Of The Aisle
Ifsomeone is buried in a grave that obstructs a public thoroughfare hemay be moved (Shulchan Aruch YD 364:5).  What about if someone isdavening Shemoneh Esrei near the aisle in Shul, may you pass?  RavBetzalel Stern (Btzel HaChochma 6:30) says you may not.  The reason isthat the main purpose of the Shul is for davening.  The public aisle ismerely for access.  It takes secondary importance to that of Tefila. 

Moreoverthe entire area of the Shul is given to the gaba'im to do as they seefit.  Therefore if they gave someone a place to daven, even if it isnear the aisle, he may do so and the aisle may be obstructed since thatis what they decided.

Moreover he says that even if someone isdavening in the aisle itself, you may not pass him.  The reason is thatthe aisle is meant for before and after tefila and not during.  Heproves this from the fact that there are seats assigned in places thatare adjacent to the aisle, and those people are anyway obstructing theaisle.

Important Note: We try to convey theTshuva to the best of our ability. We admit that our understanding maynot be accurate. Please also understand that this Tshuva may not be thefinal word on this topic. One should consult a Rav before drawing anyconclusions.