You may also be interested in the automatic categorisation listings and themed galleries.
Double helix at the north end of the 10,000th mile - but what are the bollards doing narrowing the bridge?? supposedly protecting us by making things more dangerous, like the similar bollards (now removed) at the Gonville Place crossing.
The double helix alongside NCN11 in between Addenbrooke's and Shelford. Cover photo for CamCycle's newsletter 72: http://www.camcycle.org.uk/newsletters/72/ This has the correct right handed chirality: https://youtu.be/SKhcan8pk2w