I-495: fatal crashes in every state
From 2015 to 2024, 326 fatal crashes on I-495 killed 361 people across the 5 states it runs through, the 30th most of 69 interstates. In 2024 there were 35 fatal crashes and 38 deaths on the road.
I-495 by state: fatal crashes, deaths and per mile
Massachusetts has the most fatal crashes on I-495, 140 from 2015 to 2024. Each state's stretch is counted within that state; the per-mile figure needs 20 miles or more of road.
| State | Fatal crashes | Deaths | 2024 | Miles | Per 100 miles a year | |
|---|---|---|---|---|---|---|
| 1 | I-495 in Massachusetts | 140 | 155 | 13 | No data | No data |
| 2 | I-495 in New York | 94 | 106 | 13 | No data | No data |
| 3 | I-495 in Virginia | 40 | 43 | 3 | No data | No data |
| 4 | I-495 in Delaware | 24 | 29 | 2 | No data | No data |
| 5 | I-495 in Maryland | 24 | 24 | 4 | No data | No data |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Download every interstate in every state it crosses as CSV. Free to reuse with credit: “Fatal Crash Data, fatalcrashdata.com/deadliest-roads/i-495/, from NHTSA FARS (2024 Annual Report File).”
Mileage from the FHWA Interstate route log (table 1), the only figure here not counted from FARS.
Deaths on I-495 by year
| Year | Fatal crashes | Deaths |
|---|---|---|
| 2024 | 35 | 38 |
| 2023 | 37 | 41 |
| 2022 | 49 | 56 |
| 2021 | 40 | 43 |
| 2020 | 23 | 25 |
| 2019 | 27 | 27 |
| 2018 | 23 | 24 |
| 2017 | 27 | 28 |
| 2016 | 38 | 52 |
| 2015 | 27 | 27 |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
When fatal crashes happen on I-495
The heaviest slot is Saturday, midnight to 4 am (the night from Friday), with 21 fatal crashes from 2015 to 2024. The worst hour is midnight to 1 am; the worst month is November.
| Midnight to 4 | 4 to 8 am | 8 to noon | Noon to 4 | 4 to 8 pm | 8 to midnight | |
|---|---|---|---|---|---|---|
| Sun | 5.8 percent, 19 fatal crashes | 2.5 percent, 8 fatal crashes | 1.2 percent, 4 fatal crashes | 2.1 percent, 7 fatal crashes | 2.1 percent, 7 fatal crashes | 1.5 percent, 5 fatal crashes |
| Mon | 3.1 percent, 10 fatal crashes | 1.8 percent, 6 fatal crashes | 1.5 percent, 5 fatal crashes | 1.2 percent, 4 fatal crashes | 1.2 percent, 4 fatal crashes | 4.0 percent, 13 fatal crashes |
| Tue | 3.4 percent, 11 fatal crashes | 1.8 percent, 6 fatal crashes | 0.3 percent, 1 fatal crash | 2.5 percent, 8 fatal crashes | 1.5 percent, 5 fatal crashes | 2.5 percent, 8 fatal crashes |
| Wed | 2.1 percent, 7 fatal crashes | 2.1 percent, 7 fatal crashes | 2.5 percent, 8 fatal crashes | 1.5 percent, 5 fatal crashes | 3.1 percent, 10 fatal crashes | 3.1 percent, 10 fatal crashes |
| Thu | 3.4 percent, 11 fatal crashes | 3.4 percent, 11 fatal crashes | 0.9 percent, 3 fatal crashes | 1.5 percent, 5 fatal crashes | 2.1 percent, 7 fatal crashes | 3.7 percent, 12 fatal crashes |
| Fri | 3.4 percent, 11 fatal crashes | 1.5 percent, 5 fatal crashes | 1.2 percent, 4 fatal crashes | 1.8 percent, 6 fatal crashes | 1.5 percent, 5 fatal crashes | 1.2 percent, 4 fatal crashes |
| Sat | 6.4 percent, 21 fatal crashes | 4.0 percent, 13 fatal crashes | 0.6 percent, 2 fatal crashes | 3.1 percent, 10 fatal crashes | 0.9 percent, 3 fatal crashes | 4.6 percent, 15 fatal crashes |
By hour
By month
- Jan7.1%
- Feb6.4%
- Mar4.9%
- Apr6.7%
- May7.1%
- Jun9.8%
- Jul10.1%
- Aug7.4%
- Sep9.8%
- Oct9.8%
- Nov11.7%
- Dec9.2%
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
What fatal crashes on I-495 first hit
The first harmful event was a collision with another vehicle in 40%; a fixed object such as a tree, pole or barrier in 31%, a pedestrian in 14%, a rollover in 4.9%.
| First harmful event | Fatal crashes | Share |
|---|---|---|
| Collision with another vehicle | 130 | 40% |
| Fixed object (tree, pole, barrier, ditch) | 102 | 31% |
| Pedestrian | 47 | 14% |
| Other | 20 | 6.1% |
| Rollover | 16 | 4.9% |
| Parked vehicle | 10 | 3.1% |
| Cyclist | 1 | 0.3% |
| Not reported | 0 | 0.0% |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
How fatal crashes on I-495 compare with the United States
A drinking driver was recorded in 29% of fatal crashes on I-495 from 2015 to 2024, about the US share; speeding in 35%, above the US share of 27%; a hit-and-run in 6.1%, about the US share; a driver recorded as distracted in 13%, above the US share of 8.7%; 48% of passenger-vehicle occupants killed with belt use known were unbelted, about the US share. Shares of fatal crashes from 2015 to 2024, against the share across all US roads.
| I-495 | US | ||
|---|---|---|---|
| On rural stretches | 4.3% | 43% | below the US share |
| In the dark, road unlit | 29% | 28% | about the same as the US share |
| A drinking driver | 29% | 26% | about the same as the US share |
| Speeding | 35% | 27% | above the US share |
| A distracted driver | 13% | 8.7% | above the US share |
| Occupants killed unbelted | 48% | 49% | about the same as the US share |
| Hit-and-run | 6.1% | 6.5% | about the same as the US share |
| A motorcycle involved | 9.5% | 16% | below the US share |
| Pedestrians among the dead | 17% | 17% | about the same as the US share |
Source: NHTSA Fatality Analysis Reporting System (FARS), 2024 Annual Report File (released April 2026, subject to revision). How we count
Questions about fatal crashes on I-495
- How many fatal crashes have there been on I-495?
- 326 fatal crashes killed 361 people on I-495 from 2015 to 2024, across the 5 states it runs through. In 2024 there were 35 fatal crashes and 38 deaths. Source: NHTSA's Fatality Analysis Reporting System (FARS).
- Which state has the most fatal crashes on I-495?
- Massachusetts, with 140 fatal crashes and 155 deaths from 2015 to 2024; New York is second with 94.
- When do fatal crashes on I-495 happen most often?
- The heaviest slot from 2015 to 2024 was Saturday, midnight to 4 am (the night from Friday), with 21 fatal crashes.
Other interstates
- I-10 3,274
- I-95 2,778
- I-40 2,208
- I-75 2,062
- I-20 1,789
- I-80 1,774
- I-5 1,745
- I-70 1,354
- I-35 1,241
- I-15 1,188
- I-90 996
- I-85 922
The deadliest roads in America, every interstate ranked.
Where the I-495 numbers come from
Counted from NHTSA's Fatality Analysis Reporting System, 2024 Annual Report File: every fatal crash whose road NHTSA filed as I-495, in every state, with ramps, frontage and service roads left out. Where two routes share a road, NHTSA files each crash under one of them, so a shared stretch counts on one route only. A fatal crash is one in which someone died within 30 days. The full method.