Average moving speed: 25.93km/h, distance 37.31km. The river seems to be quieter at around 10am weekdays than Sunday afternoons; I had considered taking the road that follows the river to avoid being slowed down but luckily it wasn’t necessary. I’d imagine it’s a different story if going along the river before 9am on a weekday though.

Route:

View Cambridge Semi Orbital 3 in a larger map

Here is the Google Doc with all the stats:
http://spreadsheets.google.com/ccc?
key=0At0EKwdiLZmYdFg4Mk9fdHltdWlGeWpQTHMzM3RjU3c&hl=en_GB