I don't know if that's a lot of return on investment over six years. I love being able to bike in protected bike lanes but the numbers, I would say, are dismal:
>"While the growth rate change during each year was modest, the accumulated impact over the study period was more substantial – a growth rate in bicycle counts of 69% over the 6-year study period. Locations with an on-street bike lane, also showed growth though at a lower rate than protected bikeways. On average, these on-street bike lane locations saw 99 more cyclists on average during the peak period and a similar rate of increase in ridership over time compared to locations without facilities (26% increase over 6 years)."
>"While the growth rate change during each year was modest, the accumulated impact over the study period was more substantial – a growth rate in bicycle counts of 69% over the 6-year study period. Locations with an on-street bike lane, also showed growth though at a lower rate than protected bikeways. On average, these on-street bike lane locations saw 99 more cyclists on average during the peak period and a similar rate of increase in ridership over time compared to locations without facilities (26% increase over 6 years)."