The findings could also become a tool for the Bloomberg administration to extend its re-engineering of the city’s street grid, which it says saves lives. Those changes, which have angered many drivers, include barring vehicles from major avenues and replacing hundreds of parking spaces with bicycle lanes and walkways.

The city says it is already planning a series of street changes based on data in the report.

Dozens of parking spaces will be removed next year from a major Manhattan avenue  officials would not say which one  in an experiment intended to make it easier for drivers turning left and pedestrians crossing at an intersection to see each other.

The city will also install countdown clocks at 1,500 intersections to inform pedestrians of the number of seconds remaining until the traffic light changes.

Transportation officials say they are planning a media campaign to educate New Yorkers about safe driving practices  including a reminder that the standard speed limit for the city’s streets is 30 miles an hour, a fact that Ms. Sadik-Khan, in an informal poll of her friends, discovered that almost nobody knew.

The study found that 43 percent of pedestrians killed in Manhattan did not live in that borough, and that Brooklyn had the most pedestrians killed or seriously hurt and Staten Island the fewest  both in raw numbers and per capita.

Pedestrians would be well advised to favor sidewalks to the right of moving traffic  left-hand turns were three times as likely to cause a deadly crash as right-hand turns  and to stay particularly alert at intersections, where three-quarters of the crashes occurred.

In Manhattan, about 16 percent of pedestrian crashes that led to death or serious injury involved a taxi or livery cab. Taxis account for only 2 percent of vehicles registered in the city, but at some times of day, they can make up nearly half of Manhattan’s traffic, according to some estimates  challenging the widely held perception of cabbies as the scourges of city streets.