ottonomy wrote:... do you know about the Shift-Z keyboard shortcut... It's a good quick way to spot some of the problems that get in the way of logical routing.
It's also a way for careless editors to go "fix" all the red arrows thinking that anything red needs fixing. Just because it is red doesn't mean it needs fixing. Shift+z does not show which segment the turn is restricted from, and that's really extremely important. You have to turn off Shift+z and select the segments connected to the junction a red arrow is pointing from to find out if the restriction is valid or if it needs to be allowed.