For your information, this link takes you to the Traffic Order for the B725 (Shore Road) extending the limits to beyond the Nith Inshore Rescue to the North, and past Gullsway to the South:
www.tellmescotland.gov.uk/notices/dumfries-galloway/traffic/
And here is a map of the area:
Why can’t they just make it 20 while they are at it!