Study of 1st, 8th, and Columbus Avenues in New York found that after installation of protected bike lanes on each, average motor vehicle travel times throughout the day were either unchanged or fell as much as 35% at parts of the day.

Protected Bicycle Lanes in NYC. New York City Department of Transportation, 2014. nyc.gov/html/dot/downloads/pdf/2014-09-03-bicycle-path-data-analysis.pdf