Crash record

What happens on Boston Post Road now

The numbers behind what people who use the Post Road already know: crashes are common, they cluster around the schools, and some are fatal.

The local record, 2015–2025

People hit by cars on Boston Post Road, from NYSDOT crash data.

46

cyclists hit

44

pedestrians hit

78

people injured

8

seriously injured

NYSDOT puts serious injuries in the same category as deaths when it looks for dangerous places.

Those are people on foot and on bikes. Counting everyone on the road, five people have been killed in three crashes on one 1.5-mile stretch of the Post Road since 2017.

Where people on foot and on bikes get hit

Every pedestrian and bicycle crash in Larchmont and Mamaroneck, 2015–2025. Brighter means more crashes; note the clusters around the schools and the train stations.

The map covers all streets. The counts above are for Boston Post Road alone. Use the + and − buttons to zoom. Open the full map.

On Boston Post Road the worst of it sits between the Hommocks and Mamaroneck High School. The clusters at the train stations and along Mamaroneck Avenue matter too, but they're a different problem from the crashes near the schools.

These numbers are almost certainly low. When a child on a bike is knocked down and isn't hurt, they usually get up and keep going, and no report is filed.

We have an “elevated number” of motor vehicle crashes

Those numbers are people walking and biking. Counting every reported crash on Boston Post Road in Larchmont and Mamaroneck over the same eleven years:

1,664

crashes

5

people killed

11

seriously injured

282

injured

What kind of crashes

Reported crashes by collision type, 2015–2025. The three in blue are the ones a center turn lane is designed to prevent.

Overtaking: 593 crashes, 35.6% Rear end: 394 crashes, 23.7% Sideswipe: 30 crashes, 1.8% Right angle: 201 crashes, 12.1% Right turn: 49 crashes, 2.9% Left turn: 32 crashes, 1.9% Head-on: 16 crashes, 1.0% Other/unknown: 349 crashes, 21.0% 36% 24% 12% 21%
  • Overtaking59335.6%
  • Rear end39423.7%
  • Sideswipe301.8%
  • Right angle20112.1%
  • Right turn492.9%
  • Left turn321.9%
  • Head-on161.0%
  • Other/unknown34921.0%
Overtaking, rear-end and sideswipe crashes are 61% of the total, 1,017 of 1,664.

That is the four-lane road describing itself. A driver stops in the travel lane to turn left; the car behind either brakes hard, which is the rear-end crash, or swings into the next lane, which is the overtaking or sideswipe crash. Take those three away and three out of every five crashes on this road go with them.

Notice how small the left-turn number is: 32 out of 1,664. The driver waiting to turn is rarely the one in the collision. The crash lands on the people behind, and gets recorded as something else.

NYSDOT slide headed Work Progressed to Date, listing traffic data collection: intersection traffic counts, signal timings and existing conditions modeling, and three years of crash data, ending with the line: Initial Data Review, Elevated Number of Crashes Compared to Similar Type Corridors.NYSDOT’s own review
NYSDOT reached the same conclusion from its own three years of crash records, on the last line of its traffic data slide. The full slides.

Don't wait for the fatal crash. The evidence is already here.

In 2024, a mother and her son were struck and killed at the traffic signal at Mamaroneck Avenue and New Street. That's not on Boston Post Road, but the lesson carries over. The signal had no pedestrian-only phase, no moment when every car stops so people can cross. The danger at that corner was widely known. The changes came after they died.

On Boston Post Road, the danger is known now, the fix is proven, and the state has the money set aside. There's no reason to wait.

Take action

Sources
  1. NYSDOT crash records, 2015–2025, mapped by Mamaroneck and Rye Neck Safe Routes to School
    Pedestrian and bicycle crashes in Larchmont and Mamaroneck, including the 46 cyclists and 44 pedestrians hit on Boston Post Road. Eleven years rather than ten, because 2020, with its pandemic lockdowns, wasn't a normal year.
    Crash map
  2. NYSDOT crash records for Boston Post Road, Larchmont and Mamaroneck, 2015–2025, compiled by Mamaroneck and Rye Neck Safe Routes to School
    1,664 reported crashes: 5 people killed, 11 seriously injured, 282 injured. By collision type: overtaking 593, rear end 394, right angle 201, right turn 49, left turn 32, sideswipe 30, head-on 16, other or unknown 349.
    Crash map
  3. NYSDOT, US Route 1 Complete Streets Project, Stakeholder Meeting #2, November 22, 2024
    The “Traffic Data Collection” slide: intersection counts, signal timings and existing conditions modeling, and crash data for the three years to April 30, 2024, from the NYSDOT CLEAR crash data viewer. The slide’s closing line reports an elevated number of crashes compared with similar corridors.
    Slides (PDF) · NYSDOT project documents
  4. Fatal crashes on Boston Post Road, 2017–2023
    Three crashes, five deaths, on a 1.5-mile stretch. Compiled by Mamaroneck and Rye Neck Safe Routes to School.