On my motorbike, I'd comfortably do 95 to 100 mph on the motorway. But you're asking for trouble if you push it to 120, which is what you'd need at least to rel

On my motorbike, I'd comfortably do 95 to 100 mph on the motorway. But you're asking for trouble if you push it to 120, which is what you'd need at least to reliably average 114 mph. Most cars don't travel above 90mph. I'd say that's the 98th percentile speed, with 100mph somewhere near 99.5 percentile - ie one in 200 cars going faster. North Wales is a particularly poor choice of place to speed (notorious amongst bikers for harsh enforcement), but that's probably with a focus on rural roads.