But, as there were nine 'insulae' from east to west, the main north and south street could not bisect the town.

Indeed, the south gate seems to have had five house-blocks west of it and four east of it, while the Porta Palatina stands further west, with six blocks on the west side of it.
The north and south gates, therefore, are not opposite.[76] Whether this was the original plan is not clear, nor is the age of the surviving walls and gates quite certain; the bonding courses in some of the masonry of the walls does not seem Augustan.

But the street plan may unhesitatingly be assigned to the first establishment of the town, about 28 B.C.Since, it has been extended far beyond the Roman walls.

Nearly all modern Turin has been laid out, bit by bit, in imitation and continuation of the original Roman lines.
[75] An insula is mentioned in _Notizie_, 1901, p.

391, which measured 74 x 80 metres.