Copenhagenize recently wrote a good post on bicycle lanes, paths, and general infrastructure, emphasizing how and why it is not sufficient to provide designated bike lanes only with paint. You can find it here, and I highly recommend reading it, if you are interested in bicycle planning and safety.
For the most part, Bloomington's bike routes are designated by a single line or a sharrow. Bloomington has been also making an effort to increase bike paths that are off the road, or side paths along routes like the by-pass and East third street. Most recently, the city painted a double-lined bike path on Third leading into campus.
I've written about the problems with this infrastructure many times. (Here, here, and here, for starters). I hate, hate, hate the sharrows. I find them dangerous and difficult to maneuver. They are located on the roads with heavy, high-speed traffic, where drivers are not paying attention. Unfortunately, these routes also contain many of the shops and restaurants where cyclists may want to go. They are also the quickest and easiest routes for commuters to take to work or school. That makes these routes the most logical for lanes segregated by curbs with special turn lanes.
On a few roads around downtown, you'll find the one-lined, bike paths (that come and go, randomly around downtown). But nothing is continuous, and only a few are convenient. While I do appreciate it, I often feel like the existing lanes and paths were a result of planners throwing a bone to cyclists, without really much thought on where cyclists are riding and where they need to go (hence the problem with the awesome bike box leading nowhere--not even covering two lanes, for those cyclists who need to turn left).
Then there are the side and bike paths. The B-line is great, and it goes from southern neighborhoods to the west-side of downtown. But what about the rest? They are for recreation--for the person who doesn't have a destination, just a desire to be active. And the side paths? The side paths along the by-pass and the east side of Third Street are nice, well-paved and spacious, but how many people will be taking that route, as opposed to others that go downtown? The side path on Third Street is particularly confounding, since it runs on one side of the road, and then ends at a massive intersection (the by-pass and Third Street) with no apparent connection.
Sigh. I just continue to dream that Bloomington government will magically understand why better paths are needed: lanes that are segregated (so cyclists are safe); convenient to where commuters are riding; and continuous and linking. But, then again, I'm not holding my breath.