Merrimack, NH truck route planning & crash data
Plan safer truck routes in Merrimack: commercial truck and garbage truck crashes in Merrimack and Hillsborough County, dangerous roads, seasonality and route safety data for fleets. Patterns use Hillsborough County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
2.2 deaths per 100 garbage-truck crashes vs 1.3 for all trucks.
Deadliest roads
How Hillsborough County compares with New Hampshire
Hillsborough County against New Hampshire and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Hillsborough County stands out
Full comparison
| Measure (2015–2025) | Hillsborough County | New Hampshire | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 25.3 | 30.4 | 49.7 | 17% below the state |
| Deaths per 100 crashes | 1.3 | 2.6 | 3.4 | 50% below the state |
| Injuries per crash | 0.35 | 0.39 | 0.49 | 10% below the state |
| Garbage-truck share | 3.9% | 4.2% | 2.3% | 7% below the state |
| On snow, slush or ice | 15.6% | 20.2% | 6.2% | 22% below the state |
| Morning rush (6–10 am) | 27.3% | 29.3% | 23.7% | same |
| In rain, sleet or snow | 21.5% | 22.8% | 13.8% | same |
| Winter months (Nov–Mar) | 45.7% | 47.6% | 41.9% | same |
| After dark | 15.6% | 16.3% | 24.8% | same |
Hillsborough County has lower values than New Hampshire for crashes per 100k residents / yr, deaths per 100 crashes and injuries per crash.
The headline for Hillsborough County: August garbage-truck crashes peak in August (24% of the year's total).
Overview
Police reported 1,238 crashes involving commercial trucks in Hillsborough County since 2015: 428 people were injured and 18 were killed.
Across the years with complete reporting, that is roughly one truck crash every 3 days.
Only 80 truck crashes were reported in Merrimack since 2015; patterns below come from Hillsborough County as a whole.
When crashes happen
December has the most truck crashes, 12.5% of the yearly total, while April has the fewest (6.9%).
November through March accounts for 45.7% of truck crashes here, compared with 47.6% in New Hampshire.
More truck crashes happen at 12–1 pm than at any other hour (9.5%).
Road surface: 15.6% of truck crashes were on snow, slush or ice (New Hampshire: 20.2%).
Where crashes happen
SR-111 leads within 10 miles of Merrimack with 3 fatal crashes involving a large truck since 2015. After it: Allds Street (1), Daniel Webster Hwy (1) and Everett Turnpike (1).
Garbage & waste trucks
46 crashes involved a garbage or refuse truck, a 3.7% share (New Hampshire: 4.2%).
Garbage-truck crashes peak in August (24% of them).
They recorded 2.2 deaths per 100 crashes, against 1.3 for all trucks.
Route planning tips for Merrimack fleets
- Review driver schedules for December, the month with the most truck crashes.
- Where you can, review stops along SR-111; it has the most fatal large-truck crashes nearby.
- Waste haulers: August is the peak month for garbage-truck crashes in Hillsborough County.
- Check your own stops for crash hotspots and low bridges with the free Route Planner.
About the data
Sources: the FMCSA crash file for all reported truck crashes and NHTSA FARS for fatal crashes with a large truck. Every statement here comes straight from those numbers.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Hillsborough County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| SR-111 | 3 |
| Allds Street | 1 |
| Daniel Webster Hwy | 1 |
| Everett Turnpike | 1 |
| I-293 | 1 |
| I-93 | 1 |
| Industrial Drive | 1 |
| SR-101 | 1 |
| SR-3A | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Hillsborough County) |
|---|---|
| Amherst St | 14 |
| SR-101 | 7 |
| Daniel Webster Hwy | 5 |
| Central St | 4 |
| Main St | 4 |
| Pine St @ Silver St | 4 |
| SR-13 | 4 |
| Broad St @ 21 Gusabel Ave | 3 |
Merrimack at a glance
| Population | 29,367 |
| Land area | 32.6 sq mi |
| Density | 901 per sq mi |
| Median household income (ZIP 03054) | $127,303 |
| Median home value (ZIP 03054) | $459,219 |
Waste facilities and haulers nearby
Historical data: truck crashes in Hillsborough County since the 1990s
Combines the FMCSA crash file (all reported truck crashes, real coverage from about 1990) with NHTSA FARS (fatal crashes involving a large truck, 1982–2024).
| Decade | Truck crashes / yr | Change | Fatal crashes / yr (FARS) |
|---|---|---|---|
| 1990s | 57 | — | 1.9 |
| 2000s | 82 | +43% | 1.7 |
| 2010s | 96 | +17% | 2.0 |
| 2020s | 105 | +9% | 1.8 |
In the 1990s about 57 truck crashes a year were reported; in the 2020s, about 105. Reporting coverage also changed between these periods. NHTSA counts 2.0 fatal large-truck crashes a year in 2016–19 and 1.8 a year in 2020–24.
Nearby places
Questions fleets ask about Merrimack
How many truck accidents are there in Merrimack?
Since 2015, 1,238 crashes involving commercial trucks were reported in Hillsborough County (428 injured, 18 killed).
Which road has the most fatal truck crashes in Merrimack?
Since 2015, SR-111 has had the most fatal large-truck crashes within 10 miles of Merrimack: 3.
When do most truck crashes happen in Merrimack?
December has the most truck crashes in Hillsborough County, 12.5% of the yearly total.
How many garbage truck crashes are there in Merrimack?
Since 2015, Hillsborough County has reported 46 garbage-truck crashes, or 3.7% of its truck crashes.
How do truck crashes in Merrimack compare with New Hampshire?
The yearly rate is 25.3 truck crashes per 100,000 residents in Hillsborough County, vs 30.4 for New Hampshire.
What is the best way to plan truck routes in Merrimack?
Use the free Route Planner: enter your stops to get a risk score, safer alternatives and the low bridges on your route.
2026 is a partial year. Updated October 2026.