A man has died after being struck by a driver in the Tenderloin on Friday. 

Police say the man, whose identity was not given, was struck at Polk and O'Farrell streets around 8:30 a.m. on Friday morning. He was transported to San Francisco General Hospital, where he later died, according to SFPD spokesperson Ofc. Adam Lobsinger. 

A police report provided by pedestrian advocacy organization Walk SF indicates that the pedestrian was in a crosswalk when he was struck by the driver, who was making a left turn. Although police did not provide the age of the pedestrian, a Walk SF representative says it's believed that he was a senior.

Lobsinger said that the driver of the vehicle remained at the scene and is cooperating with investigators. Driver impairment is not believed to be a factor in the collision. 

"This is the first pedestrian death this year," said Jodie Medeiros, executive director of Walk SF, in a statement. "We wish it would be the last, but we know it will not be. Last year, 18 pedestrians were killed [on San Francisco streets]."

Under the city's Vision Zero plan, the intersection of O'Farrell and Polk is identified as a high-injury corridor, as are most other streets in the Tenderloin. 

“San Francisco is doing many of the right things to make our streets safer, but not quickly enough and not aggressively enough," says Medeiros, calling for the SFMTA to quickly expand its left-turn traffic calming pilot program. 

Over the past five years, 27% of all severe and fatal crashes in San Francisco have involved a turning vehicle — the majority of them left turns. 

"We are also eager for a citywide policy on no-turn-on-red to move forward," Medeiros said.

Anyone who has information about this crash is encouraged to contact SFPD via the department's anonymous tip line at (415) 575-4444, or text TIP411 with "SFPD" at the start of the message.