This, of course, is where route planning becomes somewhat more important.... using roads where the posted limits are above the required minimum average by a reasonable amount...
In the UK it is becoming increasingly difficult to do any longer IBA rides or the insanity level rides, simply because the roads during most daytime periods are congested, so overnight sections become more crucial.... the growing use of gantry cameras and average speed cameras on roads too!
Anyone in mainland Europe want to comment on the conditions in Holland, Germany, Belgium, France, Spain, Portugal, Italy, Denmark, Sweden, Norway, Finland?
Norway/Sweden being particularly of interest for rides such as the European End to End?
Finland would be expensive if caught speeding as I believe fines are based on income!