Its really really hard when car infrastructure directly undermines it.
There's a really big, new, expensive bridge near me, only for bikes and pedestrians, but nobody uses it. Its because its a fucking pain in the ass to get to with a bike or on foot. Every piece of bike and pedestrian infrastructure has a car shaped obstacle in front of it.
I'd love to walk or bike but I hate stopping at intersections every couple fucking minutes and each one is 3-5 minutes of waiting since I live near a busy road. One time I had to wait 15 fucking minutes. I began timing it with my phone since I was getting so frustrated and that one instance made me stop walking and biking to places. I know its best to walk etc, but where I live, its a huge waste of time
I work only a mile away, I myself can walk a mile in 15 minutes easily. Walking to work in practice takes 30-40 minutes because I'm stuck fucking waiting for most of it. Driving to work takes less than 5 minutes.
Pretty sure it's hard to spend equal amount used on car infrastructure on bike infrastructure, they might need to overengineer to make bike infrastructure as expensive.