The map apps will give you strange routes sometimes because if everyone obeys those strange routes, it actually improves traffic for everyone.
Steve Mould explains it here https://youtu.be/Cg73j3QYRJc?si=qYCSU5iEZK-g2lE4
At 3:06 the paradox mentioned (https://en.m.wikipedia.org/wiki/Braess%27s_paradox) talks about how you can improve traffic by making people avoid taking an obvious route and instead have them take an apparently non-optimal route, but which will actually improve traffic for everyone.
you can see the 1 under the Fri, it's sensible notation