HERE BELOW ARE ALL THE SOURCES I USED FOR S1:
- http://www.7×7.com/ten-things-every-san-francisco-bike-rider-should-know-1786276604.html
- https://www.quora.com/What-is-the-best-bike-for-commuting-within-San-Francisco
- https://www.sfbike.org/wp-content/uploads/2014/03/Strategic-Plan_2012-2017-v2013.pdf
- http://www.sfbike.org/wp-content/uploads/2014/03/SF_Bike_Map_and_Walking_Guide_2014.pdf
- SFBIKE.org has a lot of great information and cool stuff to check out as well!