I belive a JCB Fastrac will do 50mph, Guy Martin got one up to 135mph. Its not only tractors that cause tailbacks. I was stuck behind two Mamils on expensive looking bikes. At front of the following queue was a tractor. The cyclists just carried on abreast regardless of the growing queue. There was a long lay-by they could have slowed & ridden into but no. We all followed them several miles.
Aberdeenshire tractor drivers do seem more considerate than some, maybe because we are used to single track roads with passing places.
