Its great that you are aware of the safety concerns for cyclists even when there are marked lanes available! You'll remember to look for multi-modal transportation forms.
http://www.americantrails.org/resources/trans/completestreets08.html
Legally, regular lanes in streets are available to a variety of transportation devices. A shortened reader friendly snippet regarding cycles is here http://transport.tamu.edu/bicycles/statelaw.aspx
Many auto drivers cycle, drive a motorcycle, have a child with a moped, or even walk...
I have always failed to understand the outrage directed towards cyclists for exercising their legal access to a variety of forms of transportation... How is this any different than a tractor? What if you resided in a region with a larger population of horse and buggy drivers? Would you nurture the same concerned animosity towards them?
What about the individual walking? What about the individual who uses a transportation mode outside your perceived norm due to health restrictions on driving, financial costs associated with maintaining an auto, or a desire for better personal health , or to reduce his fuel usage?
Driving a car is an earned privilege not a right. Roads were originally created for horse and buggy and later cycles, and still later a variety of autos. These access rights have never been rescinded.
Take a look around at a few other countries, or even a few cities within the USA. Multi-modal transportations is once again a topic , intertwined with terms like urban revitalization, obesity reduction, family friendly neighborhoods. Its an ugly circle that specific infrastructure won't exist without demand and demand cant increase without infrastructure irregardless of the fact that built up areas may not have available space for segregated infrastructure, nor entities the funds to in-build sidewalks with wheelchair ramps or bike lanes.
Someone may be biking, walking, skateboarding or riding a horse on the 'road' because it is the only structure available that legally supports these transportation modes. Personally, I'll be grateful that you've given this some thought, and politely share the road with me, while you drive by me pedaling or walking.
Thanks!