First, perhaps, one should review the questions:
Some time ago, there were claims that Traiectus was Aust where, before the first Severn Bridge was built, a car ferry crossed the Severn over to Beachley, a crossing known as the ‘Old Passage’. This was also claimed to be the route by which the Roman legions crossed into Wales (but is this authenticated?). If Aust was Traiectus, it means that the manuscript of the Antonine Itinerary should have read Venta Silurum-Traiectus-Abone, rather than Venta-Abone-Traiectus. And good luck to whoever tried to make sense of the distances between these stations and Aquae Solis.
It would solve the issue of why there appeared to be no mention of the crossing of the Severn but provokes a second query regarding the necessity to go to Abone/Sea Mills at all from Aust if the destination was Silchester via Bath. By what route would the legions have reached Aust and how did travellers get from Aust to Abone? There is no conjectural Roman road between Aust and Abone. Too many problems for it to be Aust.
There was Haverfield’s half suggestion that Traiectus might be Sea Mills and Abone Bitton (Bitton, he said, being quite close to the river Avon, hence Abone), again a reversal of the two stations. At least there would be no problem with the distances between the stations, if they were not also reversed. But Haverfield moved on to propose that the reading should be ‘Abone traiectus’ with another station, X, on the road to Bath. The noun traiectus, recorded mistakenly as a separate station closer to Bath, ‘extruded’ the name of station X.
Well, ‘appen …
But if the Itinerary is accepted as it is, it still leaves the problem of why no mention is made of the crossing of the Severn, but the rest is clearer and the weight of opinion nowadays seems to identify Traiectus, not as Bitton itself, but as somewhere between Willsbridge and Bitton, including the area just across the river – Keynsham.
The evidence would be stronger if there were signs of a north-south road, crossing the Avon at Keynsham. In fact, Stratford Lane, on the northern slope of the Mendips, runs north perhaps from Charterhouse. It was a Roman road disappearing into the recently man-made Chew Valley Lake, with some signs of its contination just north of the lake. For some archaeologists, that is where the road ends, and there are no clear signs that it went further north to Keynsham.
But, intriguingly, the alignment of Stratford Lane is directly to Keynsham. If the road did continue that far, Keynsham-Traiectus would be on the southern bank of the crossing place. That appears to be the route of Margary’s 540, starting at Charterhouse on Mendip and ending on the east-west Roman road near Willsbridge-Bitton; and 541a runs northwards, starting from near Hanham or Longwell Green. Both 540 and 541a seems to be largely conjectural, however.
Nevertheless, the verdict is … Traiectus was in or around Keynsham.