It's certainly going to be interesting from a GPS point of view.
I don't know what your GPS will do but my Edge 605, on coming to a crossing of ways, will try to route the shortest distance to the end and not follow the "planned" route.
I try not to make my planned routes cross, but where's the fun in that?
I was thinking I could pedal over tonight but then remembered I'm doing chauffeur duty tonight.
Still I've had a blast out to the Crystal Cafe in Maldon already today so it's all good!
Enjoy the night.