Complete separation of cyclists and cars can't always be achieved. To make sharing of the road safer I would like to propose using rumble strips instead of flat paint to separate the bike lane from the rest of the road. It would act as a physical reminder for car-drivers that they are encroaching the bike lane. This happens particularly near pinch points like road bends or crossroads. So even just a selective application of rumble strips could have a very positive effect, I believe. What's the view of the cycling community? Has it been tested?