They joined the CHP, urging anyone who may have any information about the fatal hit-and-run last Wednesday on eastbound 92, near Highway 101 near San Mateo to come forward.
The driver, Larry Pack, plunged more than 50 feet to his death over the concrete barrier.
"My dad was just coming home from work, just like everyone else's family comes home from work. And if anyone knows anything or if you've been told something, just please do the right thing and give my family the closure that we need, give my father the respect he deserves," Pack's daughter Melissa Musgrove said.
Police are looking for a dark colored SUV or a Jeep that may have hit the motorcycle, then left the scene.
The CHP is actively looking for witnesses to the incident and is asking anyone who saw the crash to call the Redwood City CHP office at (650) 369-6261.