Dangling over the intersection of West End Avenue and 95th Street on the Upper West Side of Manhattan, a new sign installed by the city warns of no left turns from 7 to 9 a.m., Monday through Friday. “What’s that — it’s nothing,” a man said to the woman next to him one night last week, referring to the sign. “They should make it all day.”

As cars drifted by after the rush hour that evening, more than a hundred people were gathered on the northwest corner of the intersection. They were there to remember Jean Chambers, who had been walking across the street there around 11 a.m. on July 10, on her way to the gym, when she was hit by an S.U.V. turning the corner. Her death was the fourth pedestrian fatality in the neighborhood this year.

During the vigil, a few cradled lighted candles. Some clutched tissues. Those gathered also rallied, urging officials to find and implement more effective ways to keep pedestrians safe. Under a traffic light, someone hoisted a sign that read: “No More Preventable Tragedies.”

Ms. Chambers, a 61-year-old artist, had lived on the Upper West Side for almost 40 years. Much of that time was spent in an apartment a block away, where she and her husband, John Chambers, had moved when they were engaged, and where they raised their daughter, Maria, who last month graduated from high school.