Here's something showing the opposite effect - that more facilities do not necessarily result in increased commuting cycling. (Do note that there is a substantial club cycling population on the weekends.) Here's a link to the abstract of a thesis (unfortunately the full thesis is in Hebrew):
http://www.graduate.technion.ac.il/T...s.asp?Id=11541
Irvine (California) is a place with near-optimal conditions for bicycling, such as suitable geographical and weather characteristics. It is a new city that had a bicycle plan incorporated into its general plan. It has very few physical or planning constraints. Around 80% of the proposed infrastructure is already completed, and Irvine’s population has high potential for bicycling. Nevertheless the percentage of bicycling in Irvine is not higher than the national or regional rates. Portland, as opposed to Irvine, has succeeded in raising the percentage of bicycling in the city.
Here's the city bikeways map, so you can see the extent of facilities in Irvine:
http://www.cityofirvine.org/depts/pw...e_bikeways.asp
The City of Irvine provides a system of bicycle lanes and trails to encourage the use of the bicycle as a safe and convenient means of transportation for both commuting and recreational purposes. This is evident by the 44.5 miles of off-road bicycle trails and 282 miles of on-road bicycle lanes provided in the City today.