Bicycle Districts x Redlined Districts
Coding the Correlation
Mobility for All Abilities Hackathon 2019
Organized by @Brownbikegirl
Photos of Brooklyn by Dinanda Nooney and P.L. Spurr via NYPL. 1938 Brooklyn Community Zoning Map via National Archive
The Team
Project Team
Data Team
Summary
Overview
Our findings:
Challenges & limitations
Context
Methodology
Data
Redlining
Early 1930’s, under federal instruction financial institutions refused or limited loans, mortgages, and insurances within specific geographic areas, especially inner-city neighborhoods on the basis of race.
“Residential security maps” were created and classifications on these maps decided the level of investment, or lack thereof. The Fair Housing Act (1968) ended this practice but not its effects.
| Hazardous | 110 |
| Declining | 180 |
| Still desirable | 64 |
| Best | 14 |
Classifications (#’s in NYC)
History of Redlining in NYC
“If you were African American, simply getting a mortgage in your NYC neighborhood was pretty much out of the question. As a result, many owners in these areas stopped investing in their properties and neighborhoods fell into decline. This affected huge swaths of New York: in Brooklyn, most of North Brooklyn, as well as Cobble Hill, Gowanus, Sunset Park, Dumbo, Fort Greene, Bed Stuy, East New York and Coney Island were redlined.”
-Brick underground
Bikes Lanes + Redlined Districts
Average Bike Lane Installation Year
On average, biking infrastructure was installed three years earlier in blue and green districts than red and yellow ones.*
Red | Yellow | Blue | Green |
2010 | 2012 | 2009 | 2007 |
*only taking into account bike lanes that were installed post 2000.
Relative Distance
| Red | Yellow | Blue | Green |
Total Street Miles | 2216 | 3497 | 1043 | 150 |
Total Bike Miles | 234 | 172 | 81 | 10 |
Bike Lanes as % of Street Miles | 10.5% | 4.9% | 7.8% | 6.7% |
Classification of Bicycle Infrastructure
Source: NYC Bike Map, DoT
Classified in open data NYC | I | II | III |
Classified in NYC Bike Map |
Bike lane type per HOLC district
Type | Red | Yellow | Blue | Green |
I (protected) | 15.9% | 19.4% | 21.1% | 28.2% |
II (standard) | 59.5% | 54.0% | 55.5% | 59.2% |
III (sharrow) | 26.2% | 27.8% | 26.3% | 17.8% |
Bike lanes in blue and green areas are more likely to be protected than in historically red-lined areas.
Thank you
Appendix