I took the new route to work this morning. It was about 11km – 3 times the distance – and 45 minutes (also thrice the old time). I had forgotten that the dirt section up to Foss St. requires a dismount at each end. Also, you have to climb up Foss St. to get out of there, so it’s best to be in low gear at the end of the path.
Given the amount of traffic on Carrillon Rd, I decided that the best was was Queen St. after all, which is only the wrong way for half of it (10 metres).