Aquincum, near Budapest, became a 'municipium' under Hadrian; its ruins, so far as hitherto planned, exhibit no true street-planning.
But that may be due to its history, for it seems not to have been founded full-grown, but to have slowly developed as best it could, and to have won municipal status at the end.
Roman Africa is here, as so often, our best source of knowledge.

At Timgad (p.

109), a town laid out in Roman fashion with a rigid 'chess-board' of streets was subsequently enlarged on irregular and almost chaotic lines.

At Gigthi, in the south-east of Tunis, the streets around the Forum, itself rectangular enough, do not run parallel or at right angles to it or to one another.[89] At Thibilis, on the border of Tunis and Algeria, the streets, so far as they have yet been uncovered, diverge widely from the chess-board pattern.[90] One French archaeologist has even declared that most of the towns in Roman Africa lacked this pattern.[91] Our evidence is perhaps still too slight to prove or disprove that conclusion.

Few African towns have been sufficiently uncovered to show the street-plan.[92] But town-life was well developed in Roman Africa.