So do you have a solution in mind, or are you asking for one? If the latter, then it's simple: narrower lanes. If you make the lanes 9ft wide in each direction,

So do you have a solution in mind, or are you asking for one? If the latter, then it's simple: narrower lanes. If you make the lanes 9ft wide in each direction, I promise that you will never again be delayed by the speed of bikers, though the bikers may find themselves upset about motor vehicle speeds being too low.