paul didn't have to make a ghost bike for me. >> reporter: in 2022, tamez was biking home from workshe was hit from behind while stopped at a red light. as a result, she suffered a traumatic brain injury. >> i luckily don't have any memories of the accident at all. >> reporter: tamez says the accident also wiped out a year's worth of memories from her life. she also has physical scars from her injuries. >> i had a tracheotomy and a feeding tube and i still have pain from the feeding tube, even though it's gone. it's been gone for two years now. >> reporter: for tamez, this ride of silence is a way for her to honor the victims. the ride has seven stops where bikers lost their lives. but every single victim since 1997 is remembered. >> this was someone's daughter. a son. a pedicab operator. >> reporter: paul valdez is considered the unofficial bike mayor of san francisco and helped to organize the event. he mourns every life lost, but there is one day he will always remember when two people were killed on their bikes just hours apart. >> i will never forget that day. i'll never forget