There have many reports of cyclists getting punctures on Hadrian's Cycleway on the Wylam Waggonway section at mile 155 near Newburn - Newcastle.
ALL of these have been caused by carpet tacks that somebody has thrown on the track. These are almost impossible to see - the local councils have been advised but meanwhile proceed with care and if you do get a puncture - please e-mail me so I can log it and report to the local council.
It may take some time to rid the track of this problem.

