What I see as being the problem in the US is that most desirable routes that connect between the home, work, shopping, etc, have already been prioritized for motor vehicle use, with little or no room left over for segregated cycling infrastructure. Most grandmas on trikes and moms towing the kids just are not enthusiastic about mixing it up with motor vehicle traffic, painted lines or not, that is wanting to get their destination without delay. In my locale, there are segregate sections of cycling and walking infrastructures, but they are for scenic viewing and do not connect with any business, shopping,or school district, with the majority of users driving their motor vehicles to access them.
Building cycling infrastructure that is rife with autocentric compromises, only keeps commuting cyclists numbers low.
Last edited by dynodonn; 12-22-13 at 09:37 PM.