Signage that doesn’t deter anyone
Credit: The Center for Land Use Interpretation (CLUI), United Divide : A Linear portrait of the USA/Canada Border. Chapter 3: The 45th Parallel. «https://clui.org/projects/united-divide/45th-parallel». All data on the CLUI site is subject to a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.
In the photo at left, small road signs block the way to the border; on the right, the border is indicated by a simple strip of paint on the ground. One side reads Canada and the other U.S.A.