These crossings are more perilous than others.

Waze, the navigation app, provided a list of the most dangerous intersections for pedestrians and cyclists in three cities. (Each city used its own metrics, described below.) Some focused on the total number of accidents, others weighted their figures by traffic and flow, and still others took into account the nature of the accidents.

Be careful when crossing these streets!

San Francisco

The city's Vision Zero SF initiative is trying to eliminate all pedestrian traffic deaths by 2024. Its analysis focused on the intersections within the “High Injury Network,” where the bulk of San Francisco's traffic-related injuries occur. The city looked at data from 2008 to 2012, weighing severe and fatal injuries more heavily.

12th St, Mission St, Otis St, and South Van Ness Ave

This enormous intersection has 17 lanes of traffic and 7 crosswalks. Between 2005 and 2012, there were 92 vehicle collisons here: 6 with bicycles, 12 with pedestrians, and 74 with other cars.

Potrero Ave and 16th St

On the periphery of the Mission district, this busy intersection features five lanes of Potrero crossing four lanes of 16th St. A pedestrian was killed at this intersection in 2013, and 10 pedestrians were hit by cars here between 2012 and 2013.

Market St, Octavia Blvd, and Hwy 101

Here, Octavia Blvd turns into an on-ramp for the 101 as it crosses Market St. Of the 42 collisions of cars and bicycles at this intersection between 2005 and 2012, six were categorized as severe.

Los Angeles

The city determined its most dangerous intersections by giving more weight to accidents that involve pedestrians and cyclists. The analysis, conducted by the Los Angeles Department of Transportation, used data for collisions between 2009 and 2013.

Eagle Rock Blvd and W Avenue 41

A crosswalk cuts across the six lanes of traffic of Eagle Rock Blvd, which many residents use to travel downtown during rush hour. West Avenue 41 is not nearly as busy.

Olympic Blvd and S Bonnie Brae St

A Los Angeles Times analysis of pedestrian accidents found that this intersection had 20 accidents involving pedestrians between 2002 and 2013. It is part of a cluster of nearby intersections that are particularly dangerous.

W Temple St and N Beaudry Ave

City statistics show that there were eight accidents at this intersection in 2014, down from 12 in 2013.

Boston

The three most dangerous intersections in Boston are all along Massachusetts Avenue, a major north-south thoroughfare. The city picked these by looking at ambulance and police data from 2012 to 2014.

Massachusetts Ave and Melnea Cass Blvd

An access point for two major highways, this intersection has 16 lanes of traffic, six cross walks, and no bike lanes. In 2013, the latest year available in the state's online records, at least 14 accidents were reported at the intersection.

Massachusetts Ave and Albany St

Just a block away from the Boston Medical Center, at least three accidents were reported here in 2013, down from seven in 2012.

Massachusetts Ave and Beacon St

A protected bike lane was added here in August after a Swiss surgeon working as a researcher in Boston was killed by a tractor trailer. According to the Boston Globe, more cycling accidents are reported at this intersection than any other in the city.

This post originally appeared on Quartz, an Atlantic partner site.

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