It might seem trivial but to me there seems to be another place where you can see that you do not need 600,000 people walking on a street to make it a public domain. That is the opinion of Yehuda HaNasi that a boat is acquired through מסירה [passing--not pulling] in a public domain. The Rashbam explains there [Bava Batra 76b] because pulling is not possible in a public domain like a רקק מים [a water-way].
Even though it is a perhaps over doing it to apply that to Shabat, still the implication seems clear. It is a water-way that ships can sail through. And on no water-way do 600,000 people walk every day.
[However pockets seem to me to be OK from the case of the divorce that is thrown into a woman's bag. It is also the Rashbam there that says openly [pgs 85-86 ]that the issue over there is if an object in a bag is thought to be in the bag or in the domain. If the bag is tied or hanging on her it is thought to be in the bag, not the domain.] [I mean to carry things in one's pockets I think is OK on Shabat even in a public domain. There is nothing in tracate Shabat to suggest otherwise and the issue I addressed in Bava Batra in the sense of acquisition.]
Even though it is a perhaps over doing it to apply that to Shabat, still the implication seems clear. It is a water-way that ships can sail through. And on no water-way do 600,000 people walk every day.
[However pockets seem to me to be OK from the case of the divorce that is thrown into a woman's bag. It is also the Rashbam there that says openly [pgs 85-86 ]that the issue over there is if an object in a bag is thought to be in the bag or in the domain. If the bag is tied or hanging on her it is thought to be in the bag, not the domain.] [I mean to carry things in one's pockets I think is OK on Shabat even in a public domain. There is nothing in tracate Shabat to suggest otherwise and the issue I addressed in Bava Batra in the sense of acquisition.]
