Don't expect walls. The two Roman temporary camps at Moss Side are the sort of monument you mostly have to imagine: a pair of rectangles traced in the fields east of Carlisle, known from cropmarks and low earthworks rather than anything that rises above the grass. What you are looking at is a farmed slope of the lower Eden country, hedges and pasture, with Scotby and Wetheral a few kilometres off and the city of Carlisle seven kilometres to the west. The point of stopping is to stand where a Roman army once dug in for the night and to let the landscape do the explaining.
Temporary camps were exactly what the name says. A unit on the march would cut a ditch, throw the spoil up into a rampart, perhaps crown it with stakes, and pitch its leather tents inside in neat rows. Next morning they might march on and leave the earthwork to slump. Northern England is dotted with them because this was a frontier in motion for decades before and after Hadrian's Wall went up in the 120s. Carlisle was Luguvalium, a fort and then a town, and the Stanegate road ran east from here towards Corbridge long before the Wall itself was planned.
The riding around here is gentle and green rather than dramatic. The lanes between Scotby, Wetheral and the Carlisle outskirts are narrow, hedged and often muddy where tractors have crossed, with blind farm entrances and the odd cattle grid. They link up nicely with the quieter roads that run west along the Solway towards Burgh by Sands and Drumburgh, where the Wall met the estuary. Expect wind off the Irish Sea, sudden showers that clear as fast as they arrive, and long summer evenings when the light goes golden over the Scottish hills across the firth.
Wetheral is worth the short detour for its village green, the surviving gatehouse of a Benedictine priory, and the railway viaduct striding over the River Eden, whose wooded gorge makes a fine short walk if you want to get off the bike. For fuel, food and anything mechanical, Carlisle is the obvious base: it has all the services of a city, plus a red sandstone castle that withstood sieges in the border wars and Tullie House, whose Roman galleries make far more sense of fields like these than any signboard could.