@John_Blumenthal I’m afraid the 1.18.1 patch does not address the “U-Turn” issue. That doesn’t mean there isn’t a plan for resolving this issue.
I think you will find you can perform a U-Turn anywhere in the game without issue, until the Zwifter makes an attempt to U-Turn exactly at the finish line of route completion. For now, please try counting to ten before U-Turning after completing a route. This should allow the U-Turn to complete normally and avoid this issue.
This issue seems related to a fix added to prevent an exploit involving U-Turns on route completion. It may be that completing a route and performing a U-Turn causes the player avatar to get stuck in a U-Turn that never starts, hence being stuck at the forced lower speed for U-Turns, and the inability to make subsequent U-Turns or choose intersection decisions.
Once the player avatar is stuck in a U-Turn, there is no way to recover the normal behavior besides shutting down and relaunching (on desktop) or force-closing and launching (on mobile).
You can also follow any developments here: