Commentary for Avodah Zarah 62:2
אמר רבי זירא לא קשיא כאן בעיר כאן בדרך
R. Zera said: There is no contradiction: The one refers to the town, the other to the open road.
Daf Shevui to Avodah Zarah
Zera solved the contraction by positing that in the town the Samaritan (or non-Jew) will not open his wine because the Jew might pop in at any moment. But on the open road, he would have time and therefore simply closing the cask is not sufficient. The Jew must be able to tell that it is has not been opened.
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