We live in Potrero Hill right by 17th and we use 17th multiple times a day. We bike for most trips including to and from school in SOMA and the UCSF gym every day. Sometimes we walk and we also drive about once a day so we experience 17th from all angles. Justin's brother, Andrew, age 15, also frequently takes the 22 bus on neighboring 16th Street. It's wonderful that we have these options to avoid contributing to more traffic.
Having a protected bike corridor on 17th would greatly improve safety. What keeps many folks from making their short trips by bike is a real concern about getting hit by a car. We want a 17th Street that is safe for biking for people ages eight to eighty.