I used to top 160MPH (indicated) every day when I was commuting back and forth between Hatfield/Welwyn Garden & Hitchin up the A1(M) on my Yam (FZR1000 Genesis). Usually though I'd use the B656 between Welwyn Village & Hitchin - much more fun, nice & twisty. I did manage 150MPH a few times along here but I had a few scary moments when I'd come across a Deer or Pheasant crossing the road . Another road I like is Coopers Green Lane between Welwyn Garden & St Albans. I used to get about 145 in a couple of places along there. Unfortunately I sold the bike about six months ago to a guy at work who's got a permanent grin from ear-to-ear now.
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Marcus 32 gig MKII (various colours) & 30gig MKIIa