So we have a straight as a die road perfectly flat road 0.5 miles long, that has double white lines , there is fantastic visibility you can see the sun 93 million miles away, there is no vehicle coming towards you, there are no turn-off's on either side of the road. There is a lone cyclist doing his/her best to maintain 15mph into a slight headwind, there are now 28 vehicles behind him/her as not one of them can overtake without straddling the white lines, should the cyclist slow down to 10mph to allow the vehicles to pass?