Examples of oblique planning in South Norfolk "A"
5:3 relationship
This map shows part of the Roman road, the modern A140, immediately south of Venta Icenorum. It is highlighted in red. The principle road segment passes through the centre of sides of squares. The road also crosses the River Tas at the same point as a north-south limes
Based on late 19th and early 20th century Ordnance Survey mapping.
Note also that there is another segment of this road having the same oblique relationship to the grid. Hence the two are parallel.
4:3 and 5:4 relationships
Here (north of Bungay, at the south eastern extremity of the area shown on the map of the cadastre) we see a road with segments at 4:3, and possibly at 3:4. This road, called Stone Street, has been accepted as Roman for many years. The other road alignment, at 5:4, has recently been proposed (independently from the centuriation hypothesis).
Based on the 1983 Ordnance Survey 1:25,000 map with the permission of the Controller of her Majesty's Stationary Office "C" Crown Copyright.