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n0mesorah,
“I don’t know how you got that disagreeing with the Magen Avraham’s interpretation of mefulash is mechudash.”
The Magen Avraham (345:6; based on the Bais Yoseph) and most poskim (Olas Shabbos, Tosfos Shabbos, Elya Rabbah, Prei Megadim, Shulchan Aruch Harav, Mishnah Berurah, and Aruch Hashulchan) assert that mefulash m’shaar l’shaar infers mefulash u’mechavanim m’shaar l’shaar, meaning runs straight from gateway to gateway. Therefore, since all Rishonim (and Achronim) maintain that mefulash is a fundament of a reshus harabbim even in a city that is not walled (e.g. Rashi, Eruvin, 59a; Ravyah, Eruvin, siman 379; Rokeach, siman 175; Rid, Piskei, Sukkah 43a, and the majority of Rishonim who mention the criterion of mefulash without the qualifier of city walls), and the Gedolie Haposkim uphold that mefulash infers mechavanim, hence, all city streets would need to be mefulash u’mechavanim m’shaar l’shaar to be classified as a reshus harabbim, irrespective if the city is walled or not.
This is contrary to Rav Moshe and Rav Aharon, who maintained that mefulash is a criterion of a reshus harabbim, but mechuvanim only applies to a walled city. Furthermore, the SA is referring to a walled marketplace. Hence from the SA we only see that a platya may need to be walled to fulfill the criterion of mefulash umechavanim. Mavo’os hamefulashim, which our streets on the whole are classified as, no doubt would need to be mefulash and mechavanim, walled or unwalled.
[The Shulchan Aruch in 345:7 uses the words rechovos and shevakim, which, according to most poskim, are just alternative labels for marketplaces (see Metzudos Tzion, Shir Hashirim 3:2; Mayim Rabim, siman 38, and Bais Ephraim, siman 26 p. 44b). The Magen Avraham indicates on the word rechovos (345:5) that sratyas are included in these halachos set forth by the Shulchan Aruch. In 345:8-9 the Shulchan Aruch deals with mavo’os hamefulashim.]