It's not surprising that drivers may have a lack of information. How many questions on your drivers test were related to bikes in any way? Are they even mentioned in the state issued "drivers manual" which is basically a study guide for drivers tests?
Here's a link: http://www.dmv.state.pa.us/drivers_manual/pa_driversman.shtml
There is no section listed in the TOC about bikes. There is no mention of what bike lanes or sharrows are. Is there a statement about the buffer space required when passing a bike on the left? Do you remember any of these questions from your drivers test (if you drive)?
Did you even have to parallel park, I didn't. Not that I couldn't do it, but it wasn't part of the test.
I seriously think the drivers tests need to be a little more thorough, and be more inclusive to pedestrian and bike related issues. Besides that, I think we all need to be informed of motorist and cyclist safety issues.
BTW, here's the state bicycle drivers manual.
http://www.dot.state.pa.us/Internet/Bureaus/pdBikePed.nsf/infoAcknowledgements?OpenForm
Also, my electric company and bank send me tips about how to save money and conserve electricity. Does my state send me tips about safe driving (or sharing the road with bikes?) when I renew my drivers license or auto registration... nope.
I'm just trying to point out there are a lot of areas for improvement, and not just complain too much.