This route goes from Overstone Ct, along the riverbank to the A4119 and across the river, and back to the same location via the A4160 and Dumballs Rd. The larger peak coincides with being on the A4160. The drop at 17:55 may coincide with entry to a shop. The larger drop at 18:05 to 18:09 coincides with entering the College building near Dumballs Rd.