As an occasional cyclist I think that if everyone abides by road regulations and applies a degree of consideration and common sense, there is no problem. Common sense for instance would dictate that any cyclists who ride two abreast over a crest, despite the fact that they may not be breaking any law, are nevertheless not particularly interested in self preservation as the reaction time for a driver possibly travelling over three times their speed may be very short if they encounter cyclists over a crest. Admittedly drivers should be wary when breasting crests. The old 'when safe to do so' is the guiding principle. I personally think that being able to legally cross an unbroken line is in the interest of both drivers and cyclists. I would think it highly unlikely that a driver would have not crossed an unbroken line on a 100kph road, when safe to do so, to overtake a cyclist prior to the law change. The law now permits drivers to do so legally. However I recently came across a quote which appeals greatly to me: “Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.” (Rene Descartes)