Are Massachusetts Crashes More Dangerous at Night?

Yes, and the size of the gap is larger than almost anyone expects. Across the 405,239 crashes MassDOT recorded in Massachusetts from 2022 through 2024, 110,263 happened after dark. That is 27.21 per cent of the crashes. Those same hours account for 518 of the state’s 1,087 fatal crashes, which is 47.65 per cent of the deaths. Put the two numbers side by side and the shape of the problem is clear: roughly a quarter of the crashes produce roughly half of the fatalities. The fatal rate in daylight is 1.81 per 1,000 crashes. On a lit road after dark it is 3.74. On an unlit road after dark it is 8.49, which is 4.69 times the daylight rate. What does not change is the injury rate, and that turns out to be the most revealing number on this page. Every figure here comes from MassDOT crash records and can be checked community by community in the Massachusetts crash report. To talk through a specific crash, call Jim Glaser Law at (617) JIM-WINS. The line is answered 24 hours a day. The first telephone consultation is offered without charge.

What the Light Field Actually Records

Every Massachusetts crash record carries a field describing the ambient light at the moment of the collision. It is filled in by the responding officer and it has a small set of values: daylight, dawn, dusk, dark with the roadway lighted, dark with the roadway not lighted, and dark with the lighting unknown, plus unknown, other and not reported.

That is a description of conditions, not of the clock. A crash at five in the afternoon in December is recorded as dark. A crash at five in the morning in June is recorded as daylight. This is the better measure for the question people are actually asking, which is about visibility rather than about the hour on a dashboard.

Here is the full statewide split across the three years.

Light condition	Crashes	Share of all crashes	Fatal crashes	Fatal per 1,000
Daylight	271,640	67.03%	492	1.81
Dark, roadway lighted	83,770	20.67%	313	3.74
Dark, roadway not lighted	23,676	5.84%	201	8.49
Dusk	11,480	2.83%	43	3.75
Dawn	7,010	1.73%	13	1.85
Dark, lighting unknown	2,817	0.70%	4	1.42
Unknown	3,176	0.78%	3	0.94
Not reported	1,200	0.30%	18	15.00
Other	468	0.12%	0	0.00

The statewide fatal rate across all conditions is 2.68 per 1,000 crashes.

Answer Capsule

Massachusetts crashes are substantially more likely to be fatal after dark, and no more likely to cause an injury. From 2022 through 2024 MassDOT recorded 405,239 crashes, of which 110,263, or 27.21 per cent, occurred in one of the three dark light conditions. Those crashes account for 518 of the 1,087 fatal crashes, which is 47.65 per cent of all Massachusetts road deaths in the period. The fatal rate is 1.81 per 1,000 crashes in daylight, 3.74 on a lit road after dark, and 8.49 on an unlit road after dark, against a statewide 2.68. The injury rate barely moves: 22.47 per cent of daylight crashes produced a non-fatal injury against 23.78 per cent of unlit dark crashes and 22.89 per cent statewide. Dusk behaves like darkness at 3.75 fatal per 1,000 while dawn behaves like daylight at 1.85. Pedestrians are involved in 19.22 of every 1,000 crashes after dark against 12.80 in daylight, and 35.43 per cent of all pedestrian crashes in the state happen after dark. Cyclists are the opposite, at 78.81 per cent in daylight. Crashes after dark move away from junctions: intersections account for 30.96 per cent of dark crashes against 36.49 per cent of daylight crashes. Revere has the highest dark share of any community with 300 or more dark crashes at 40.95 per cent, followed by Everett at 38.49 and Boston at 37.21, against a statewide 27.21. Boston recorded 45 of its 65 road deaths after dark. These figures are associations in public crash data and not statements of cause. This is general information about public crash data and Massachusetts law, not legal advice. Call Jim Glaser Law at (617) JIM-WINS; the first telephone consultation is offered without charge.

The Finding That Actually Matters: Injuries Do Not Move

If darkness simply made crashes worse across the board, the injury rate would rise with the fatal rate. It does not.

Light condition	Crashes	Non-fatal injury crashes	Injury share of that condition
Daylight	271,640	61,037	22.47%
Dark, roadway lighted	83,770	20,942	25.00%
Dark, roadway not lighted	23,676	5,631	23.78%
Dusk	11,480	2,639	22.99%
Dawn	7,010	1,540	21.97%

The statewide injury share is 22.89 per cent. Every light condition sits within about two points of it. The spread from the lowest to the highest is 21.97 to 25.00 per cent.

Now set that beside the fatal rates in the first table, which run from 1.81 to 8.49, a spread of more than four and a half times across the same rows.

Those two facts together say something specific. Darkness is not producing a general increase in harm. It is not that more crashes hurt someone after dark; almost exactly the same proportion do. It is that the crashes which do go badly go much further. Whatever separates a dark crash from a daylight one acts on the severe tail of the distribution and leaves the ordinary middle of it alone.

That is a useful thing to know before an insurer characterises a night crash as a routine one.

That split is not how every condition behaves. Cut the same file by road surface and the two rates move together instead of apart: snow and ice are lower on the fatal rate and lower on the injury rate at the same time, which points at a different mechanism. The comparison is worked through in do snow and ice cause the deadliest crashes in Massachusetts.

Lit and Unlit Are Two Different Situations

The single largest jump on the page is between the two kinds of darkness.

A crash on a lit road after dark is fatal at 3.74 per 1,000. On an unlit road it is 8.49 per 1,000. That is 2.27 times worse, and it is the difference between two crashes that a report would describe with the same word.

Unlit darkness is also the rarer situation. It accounts for 23,676 crashes, 5.84 per cent of the state total, against 83,770 on lit roads. Massachusetts is a lit state for the most part, and the fatal burden is concentrated in the fraction of it that is not.

The honest caveat belongs right here rather than at the bottom. Unlit roads are not lit roads with the lamps switched off. They are, on the whole, rural, faster, further from a hospital and less likely to have a sidewalk or a signal. Posted speed alone would be expected to move a fatal rate. So the 8.49 figure is real and the 2.27 ratio is real, and neither of them establishes that lighting is what is doing the work. What the numbers support is that the unlit road at night is the highest-severity setting in the Massachusetts crash file, not why it is.

Dusk Is Dangerous and Dawn Is Not

This is the pattern nobody predicts, and the two rows sit next to each other in the table.

Dusk: 11,480 crashes, 43 of them fatal, a rate of 3.75 per 1,000. That is indistinguishable from a lit road in full darkness, which sits at 3.74.

Dawn: 7,010 crashes, 13 of them fatal, a rate of 1.85 per 1,000. That is indistinguishable from broad daylight, which sits at 1.81.

Two conditions with roughly the same amount of available light, twice apart on fatality. The MassDOT data does not say why, and this article will not invent a reason. Three candidates are worth naming as untested possibilities rather than explanations: the evening peak carries more traffic than the morning one, alcohol is present in the evening in a way it is not at six in the morning, and the driver population at dusk has been awake and working all day. None of those is measured in this file.

The practical point stands on its own regardless of the cause. Whatever people assume about twilight, the evening half of it behaves like night in this data and the morning half behaves like day.

People Outside a Vehicle

Darkness changes who is involved, and it changes it in opposite directions for the two groups most exposed.

Pedestrians are over-represented after dark. Across all 5,980 pedestrian crashes in the file, 2,119, or 35.43 per cent, happened in one of the three dark conditions, against darkness accounting for 27.21 per cent of crashes overall. Measured as a rate, pedestrians are involved in 19.22 of every 1,000 crashes after dark against 12.80 in daylight. The single highest pedestrian rate of any condition is a lit road after dark, at 20.90 per 1,000, which is the signature of an urban street with lamps, crossings and people on it. Where those crashes happen by community is in the Massachusetts pedestrian crash data.

Cyclists run the other way. Of 4,356 bicycle crashes, 3,433, or 78.81 per cent, happened in daylight, and only 656, 15.06 per cent, after dark. As a rate that is 12.64 bicycle crashes per 1,000 in daylight against 5.95 after dark. Cyclists are largely a daylight population in Massachusetts, which is a fact about when people ride rather than about how safe riding is. The community pattern is in which Massachusetts city has the most bicycle crashes.

Motorcyclists sit closer to the cyclists, at 72.5 per cent of their crashes in daylight on a separate 5,623-crash denominator, which is set out with the rest of the rider conditions data in where motorcycle accidents happen in Massachusetts.

After Dark, Crashes Move Away From Junctions

Massachusetts crashes at intersections were measured across the whole file in the Massachusetts intersection crash data, which found four-way, T, Y and five-point junctions together accounting for 34.46 per cent of all crashes, and not-at-junction locations for 57.05 per cent. Splitting that same measure by light gives a cross nothing on this site has carried.

Where the crash happened	Daylight share	After-dark share
Not at a junction	54.79%	62.02%
Intersection (four-way, T, Y, five-point)	36.49%	30.96%
Four-way intersection	17.44%	15.78%
T-intersection	16.64%	12.89%
Driveway	2.45%	1.32%
On-ramp or off-ramp	3.79%	3.26%
Traffic circle	1.52%	1.32%

The night crash is a mid-block crash. Intersections lose more than five points of share after dark and open road gains more than seven. T-intersections fall the furthest of any single category, from 16.64 per cent of daylight crashes to 12.89 per cent of dark ones.

Part of that is simply errands. Turning movements, shopping trips and driveway manoeuvres are daytime activities, which is consistent with the driveway row falling from 2.45 to 1.32 per cent and with the community pattern in the Massachusetts driveway crash data. But the shift toward open road also points the same way as the fatal rate, because the crash types that happen away from junctions are the higher-speed ones. What kinds of collision those are is set out in the most common crash type in Massachusetts.

Which Communities Have the Most Crashes After Dark

Every community with at least 300 dark crashes across the three years, ranked by what share of its own crashes those represent. There are 102 such communities. The statewide figure is 27.21 per cent.

Community	Total crashes	After dark	Dark share
Revere	2,298	941	40.95%
Everett	964	371	38.49%
Boston	17,407	6,477	37.21%
Lynn	6,074	2,211	36.40%
Tyngsborough	917	312	34.02%
Chelsea	2,920	975	33.39%
Westport	1,108	369	33.30%
Brockton	7,378	2,457	33.30%
Salem	1,677	552	32.92%
Milton	2,135	701	32.83%
Dracut	1,335	435	32.58%
Malden	2,791	908	32.53%
East Bridgewater	1,148	373	32.49%
Avon	945	301	31.85%
Lawrence	5,385	1,714	31.83%

At the other end of the same cohort sit Needham at 18.43 per cent, Northampton at 19.29, Wellesley at 19.89, Gardner at 20.25, Reading at 20.66, Natick at 21.08 and Cambridge at 21.45.

Boston is the striking entry, because it is not a small town with an unusual road. It records more crashes than any community in Massachusetts at 17,407, and 6,477 of them, more than a third, happened after dark. A community’s dark share is partly a statement about its night-time economy and partly about how much of its daytime traffic is local errand driving, and this table does not separate the two.

Which Communities Lose the Most People After Dark

This is the table that carries the weight, and it needs its caution stated first. Fatal crashes are rare, so these percentages rest on small numbers. Only communities with at least 8 fatal crashes across the three years are listed, and even at that floor a single crash moves a figure by several points. Statewide, 518 of 1,087 fatal crashes, or 47.65 per cent, happened after dark.

Community	Fatal crashes	Fatal after dark	Share after dark
Framingham	9	7	77.8%
Wilmington	8	6	75.0%
New Bedford	14	10	71.4%
Brockton	20	14	70.0%
Boston	65	45	69.2%
West Bridgewater	9	6	66.7%
Chicopee	22	14	63.6%
Worcester	29	18	62.1%
Springfield	44	26	59.1%

Boston is the entry least vulnerable to the small-number problem, because 65 fatal crashes is the largest count in the state. Forty-five of the sixty-five people killed on Boston’s roads across those three years died in a crash the record describes as dark, while only 37.21 per cent of Boston’s crashes happened then. Springfield, Worcester, Brockton and New Bedford all show the same shape on smaller but still substantial counts.

Where Massachusetts road deaths concentrate geographically, independent of light, is set out in Massachusetts fatal crash locations.

What These Numbers Cannot Tell You

Five limits, stated plainly, because a figure quoted without them is worth less than no figure.

This is an association, not a cause. Darkness travels with other things: alcohol, fatigue, higher speeds on emptier roads, a different mix of road types, and a different set of drivers. Nothing in the MassDOT file separates those from the absence of light, and nothing on this page should be read as saying that darkness itself killed anyone.

The light field is an officer’s assessment at the scene, recorded after the fact in most cases. It is a good field and it is not an instrument reading.

The “not reported” row is an artifact, not a finding. Its 1,200 crashes carry 18 fatal, a rate of 15.00 per 1,000 against a statewide 2.68. It is far more likely that fatal crashes are the ones where the light field goes unfilled, because the scene is being handled as a death investigation rather than as a report, than that missing paperwork is dangerous. It is shown in the table for completeness and excluded from every comparison in the text.

The fatal community table rests on small counts. Framingham’s 77.8 per cent is 7 deaths out of 9. Read the order as a rough grouping, not as a ranking.

The file covers crashes that were reported. A minor crash on an empty road at two in the morning is less likely to be reported at all than the same crash at two in the afternoon, which, if anything, would push the measured dark fatal share up rather than down.

What This Means for a Claim

Two things, and neither of them is complicated.

The first is that an insurer will reach for darkness as a fault argument, because it is the easiest one available. The suggestion is that a driver who could not see should have been going slower, or that a pedestrian in dark clothing contributed to their own injury. Massachusetts uses comparative negligence, so that argument is about a percentage rather than about whether a claim exists, and the way fault gets assigned is set out in how fault is determined in a Massachusetts car accident. Darkness is a condition both drivers were in. It is not, by itself, a finding about either of them.

The second is that the severity profile on this page is the reason night crashes more often cross the thresholds that matter in a Massachusetts claim. The fatal rate is the visible end of that. The same shape shows up short of a death, in the injuries that clear the statutory bar for a claim against the at-fault driver, which is explained in the serious injury threshold.

If the crash happened in Boston, Brockton or Lynn, those city pages carry the local road and venue detail, and for a fatal crash the Boston wrongful death page covers what that claim involves.

Frequently Asked Questions

Q: What percentage of Massachusetts crashes happen at night?

A: 27.21 per cent. Of the 405,239 crashes MassDOT recorded from 2022 through 2024, 110,263 occurred in one of the three dark light conditions. Adding dusk and dawn brings it to 31.77 per cent. The record describes ambient light rather than the time on the clock, so a December evening crash counts as dark and a June dawn crash does not.

Q: How much more likely is a night crash to be fatal in Massachusetts?

A: The fatal rate is 1.81 per 1,000 crashes in daylight and 4.70 per 1,000 across all dark conditions combined, which is 2.6 times higher. Split by lighting, it is 3.74 per 1,000 on a lit road after dark and 8.49 on an unlit one. The statewide rate across all conditions is 2.68 per 1,000.

Q: Are you more likely to be injured in a crash at night?

A: Barely. 22.47 per cent of daylight crashes produced a non-fatal injury, against 25.00 per cent on lit dark roads and 23.78 per cent on unlit ones, with a statewide figure of 22.89 per cent. The injury rate is essentially flat across light conditions while the fatal rate varies by more than four times, which is the most important pattern in this data.

Q: Is driving at dusk as dangerous as driving at night?

A: On this measure, yes. Dusk crashes are fatal at 3.75 per 1,000, which matches the 3.74 rate for a lit road in full darkness. Dawn is different, at 1.85 per 1,000, which matches daylight’s 1.81. The two twilights behave nothing alike in the Massachusetts file.

Q: Which Massachusetts community has the highest share of crashes after dark?

A: Among the 102 communities with at least 300 dark crashes in the three years, Revere leads at 40.95 per cent, then Everett at 38.49, Boston at 37.21 and Lynn at 36.40, against a statewide 27.21 per cent. The lowest in that cohort is Needham at 18.43 per cent.

Q: How many of Boston’s road deaths happen after dark?

A: 45 of 65 across the three years, or 69.2 per cent, while only 37.21 per cent of Boston’s crashes happened after dark. Boston has the largest fatal count of any Massachusetts community, so it is the entry in this data least affected by small-number noise.

Q: Are pedestrians at more risk after dark in Massachusetts?

A: Yes on this measure. 35.43 per cent of all pedestrian crashes in the state happened after dark, against darkness accounting for 27.21 per cent of crashes overall. As a rate, pedestrians appear in 19.22 of every 1,000 dark crashes against 12.80 in daylight, and the highest rate of any single condition is a lit road after dark at 20.90 per 1,000.

Q: Does the insurance company get to blame me for driving at night?

A: It can raise visibility as a comparative negligence argument, and it commonly does. Massachusetts assigns fault as a percentage rather than treating it as all or nothing, so the question is how much, not whether there is a claim. Darkness was a condition both drivers were in, and the rules for allocating fault are the same ones that apply in daylight.

Q: Is Jimmy Knows AI giving me legal advice?

A: No. This is general information about public crash data and Massachusetts law, not legal advice, and reading it does not create an attorney client relationship. Whether any of it applies to your situation depends on facts this page does not know. To discuss a specific crash, call Jim Glaser Law at (617) JIM-WINS. The line is answered 24 hours a day. The first telephone consultation is offered without charge.

Talking to a Lawyer

The useful thing a person can take from this page is that a night crash is not a routine crash with worse lighting. It sits in the part of the Massachusetts data where outcomes are most severe, and it arrives with a ready-made argument about visibility that will be made against whoever is making the claim.

That argument is answerable, and answering it is a matter of evidence rather than of impression: what the road was posted at, whether it was lit, where the vehicles came to rest, what the other driver’s own account says about speed and distance. Those facts are easiest to establish early, and the crash report is the first place they are written down. What the road was posted at is its own measure, and it behaves differently from darkness: it moves the fatal rate and the injury rate in different directions, which is set out in which Massachusetts speed limits carry the deadliest crashes.

To talk through a crash that happened after dark, call Jim Glaser Law at (617) JIM-WINS. The line is answered 24 hours a day. The first telephone consultation is offered without charge.