When I bicycle around Boston it’s mostly vehicularly. While the rules of the road generally give some order to the roads- I always need be extra vigilant and assume drivers don’t see me.
I’m experienced, follow the rules of the road, and best practices for bicycling. I can do everything in my power- but there’s no barrier if a driver is inattentive.
No amount of education can fix an unequal match of people riding bikes next to cars. And only re-designing the roads will invite more people to ride a bicycle.