Went to Udon today on the way back Police officers were placed every 1 km from Udon to Ban Dung. This was due to Princess Bajrakitiyabha ( the kings granddaughter  known as Princess Pa) going to visit Kham Chanot which she does on a regular basis as she works in Udon. Fortunately we just made it back before the Royal visit and hence did not have to pull over and wait for her to pass.