The accident happened around 1:30 p.m. at Skyline Boulevard and Elk Tree Road, just after a sharp curve.
It's a popular place for bicyclists to go riding. But neighbors say there's no room for error on these dangerous curves.
A 50-year-old woman was riding her bicycle downhill on the northbound lane on Skyline when she collided with a minivan that was making a turn toward her lane.
The accident happened in front of the house where Nicole Lazarus lives with her fiancé.
"It's a very blind curve and bicycles come flying around that corner, and right before the corner there's a turn on Elk Tree Road and sometimes things happen too fast," Lazarus said. "People are driving 45 miles per hour on the road and there's no place for a bicycle to go."
The driver is an OnTrac employee.
"The driver is being cooperative," said CHP PIO Officer Moises Escoto. "He is a 22-year-old male. He stopped at the scene."
Lazarus tells us her fiancé went to the bicyclist's aid.
"After she fell down, she was moaning and groaning and they were trying to call her name and get her to respond," Lazarus said. "But she was unresponsive."
There is this tragic irony. A floral memorial marks the same location of a deadly accident two years ago, where a car plowed into a motorcyclist.
Lazarus tells us that after the fatal motorcycle accident, neighbors wanted stop signs or something put on the road to tell motorists that there are dangerous curves. Today, that sounds like a pretty good idea.
