Gates and Delasos in a Large City
A Torah-level reshus harabim raises requirements beyond an ordinary neighborhood tzuras hapesach. The role of delasos, gates, and doors depends on the governing view and the form of the public routes.
Closing a Torah public domain
Under the views that require delasos, ordinary forms of doorways cannot by themselves enclose a complete reshus harabim. Actual doors or gates must close, or be capable of closing, the public route in the manner required by the accepted psak.
The details are disputed among the poskim. A city eruv must state which view it follows and show that the physical gates satisfy it; the word gate on a map is not enough.
Traffic barriers are not automatically doors
Historic city gates were built across an opening in a wall. Modern toll arms, movable barriers, security gates, and bridge equipment may stand beside or above only part of a road.
Their width, location, ability to close the relevant opening, and relationship to the surrounding boundary all matter. A structure used to control vehicles may leave sidewalks, service lanes, or the rest of the halachic breach fully open.
A city with many entrances
Bridges, tunnels, highways, local streets, rail lines, and pedestrian access can create many entrances. Each one must be closed or integrated into the enclosure under the same halachic system.
A prominent gate at one crossing cannot compensate for other public routes left untreated. The analysis must follow the complete perimeter rather than the best-looking entrance.