The cycling skills manual "Cyclecraft", the foundation of Bikeability, the UK's national standard for cycle training, defines the terms "primary riding position", where the cyclist will be more visible and predictable to motor vehicle traffic, as being in the center of the traffic lane, and "secondary riding position" as being to the side of moving traffic, but not closer than from the edge of the road. It states that it is sensible to use the primary riding position as the normal position, only using the secondary riding position when it is safe, reasonable, and necessary to allow faster traffic to pass.