Most bike activists don't have an unspoken strategy of slowing people down. They want to be able to use their bike to get places safely and quickly and they wan

Most bike activists don't have an unspoken strategy of slowing people down. They want to be able to use their bike to get places safely and quickly and they want others to feel able to do that too. It doesn't make sense to create biking / walking lanes raised up on pillars because a) that introduces artificial hills and b) it increases effort to get places - you'll only be able to get on or off the raised system at a ramp, which might be inconvenient. In London the average car speed is 11-12 mph, and then you'll have to walk to / from a car park. Cars aren't always fast and point to point