Couldn’t cross a dual carriageway!

Not sure if this is the right place as I’m new to the app. It’s a great app and took me out from old hall lane in Manchester to John Lewis Cheadle along some lovely off-road paths I haven’t been long before. However, the reverse journey took me down the left-hand side of the A34 on a cycle path. It then asked me to cross the A34 onto Broadway. However, there is no way of crossing that road at that point. Is this an app error? thanks very much, Philip