Following common sense for someone who is experience on a bike will make them do things which other road users don't expect. Such as riding around a very large puddle on the left hand side of the road; I can't see the road surface I don't know what's under the water so I'm not prepared for any pot hole, sunken drain covers etc, thus it's not safe to use that road space & I will avoid it. I suppose I should add that before reading cyclecraft I was cycling in primary through pinch points after a nasty accident involving one. But you try & explain to a motorist that it's down right dangerous for a car & a bike to be in the pinch point & they don't want to hear it. It's not about people understanding or not imo, people who kind of remember bits of the HWC only remember the parts that are convenient to them.