We do. Big highways without enough pedestrian bridges have a horrible effect on pedestrians and bikes, basically cutting towns and cities in half. I currently work just north of a 6-lane toll road, and it's a reasonable bike commute. I used to work just south of it, and it was a much worse commute, because there are no pedestrian bridges or small quiet roads crossing it, only a few busy arterial roads, full of drivers already in highway mode, trying to dive for an exit ramp, not thinking about pedestrians or bikes.
