I find that the amount of space provided with a normal lane plus a bike lane is usually better left unstriped as a single extra-wide lane. This provides the advantages of a bike lane (extra passing space) without the disadvantages (debris accumulation, motorist and police harassment for riding left of the stripe, encouragement to ride in the door zone, etc.. We had a lot of roads here in Cary, NC that had nice, clean 16' lanes until they got striped with bike lanes. Now they are often filled with debris and I get a lot more harassment when I ride, because I am often to the left of the stripe.

It's important to separate the issue of striping from space. More space makes it easier for drivers to pass safely. But segregation striping probably creates more problems than it solves on most roads.