Plymouth, CT truck route planning & crash data
Plan safer truck routes in Plymouth: commercial truck and garbage truck crashes in Plymouth and Naugatuck Valley Planning Region, dangerous roads, seasonality and route safety data for fleets. Patterns use Naugatuck Valley Planning Region numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
4.3 deaths per 100 garbage-truck crashes vs 2.0 for all trucks.
Deadliest roads
How Naugatuck Valley Planning Region compares with Connecticut
Naugatuck Valley Planning Region against Connecticut and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Naugatuck Valley Planning Region stands out
Full comparison
| Measure (2015–2025) | Naugatuck Valley Planning Region | Connecticut | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 35.5 | 40.2 | 49.7 | 12% below the state |
| Deaths per 100 crashes | 2.0 | 2.2 | 3.4 | 9% below the state |
| Injuries per crash | 0.35 | 0.39 | 0.49 | 10% below the state |
| Garbage-truck share | 2.5% | 3.3% | 2.3% | 23% below the state |
| On snow, slush or ice | 5.5% | 6.2% | 6.2% | 11% below the state |
| Morning rush (6–10 am) | 26.9% | 24.4% | 23.7% | 1.1× the state |
| In rain, sleet or snow | 12.9% | 14.1% | 13.8% | 8% below the state |
| Winter months (Nov–Mar) | 41.6% | 41.3% | 41.9% | same |
| After dark | 24.2% | 28.0% | 24.8% | 14% below the state |
Naugatuck Valley Planning Region sits below Connecticut on crashes per 100k residents / yr, deaths per 100 crashes and injuries per crash. It runs above Connecticut on morning rush (6–10 am).
The headline for Plymouth: I-84 most fatal truck crashes within 10 miles of Plymouth: 8 since 2015.
Overview
Naugatuck Valley Planning Region has recorded 1,924 truck crashes since 2015, with 679 people injured and 37 killed.
In complete reporting years that works out to about one truck crash every 2 days.
Only 24 truck crashes were reported in Plymouth since 2015; patterns below come from Naugatuck Valley Planning Region as a whole.
When crashes happen
Truck crashes peak in October (10.5% of the year) and are lowest in April (7.1%).
The five winter months (November to March) hold 41.6% of truck crashes, against 41.3% across Connecticut.
By time of day, 7–8 am stands out with 8.0% of truck crashes.
5.5% of truck crashes here happened on snow, slush or ice, against 6.2% across Connecticut.
Where crashes happen
The deadliest road for trucks within 10 miles of Plymouth is I-84, with 8 fatal large-truck crashes since 2015. Next come East Main St (1), Echo Lake Road (1) and SR-4 (1).
Garbage & waste trucks
Garbage trucks account for 46 of the truck crashes here, or 2.4%, compared with 3.3% in Connecticut.
Their busiest month is March, with 15% of garbage-truck crashes.
Deaths per 100 garbage-truck crashes: 4.3, vs 2.0 for all truck crashes.
Route planning tips for Plymouth fleets
- Review driver schedules for October, the month with the most truck crashes.
- Where you can, review stops along I-84; it has the most fatal large-truck crashes nearby.
- Waste haulers: March is the peak month for garbage-truck crashes in Naugatuck Valley Planning Region.
- Morning starts matter: 26.9% of truck crashes fall between 6 and 10 am, higher than Connecticut.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
About the data
This report uses the FMCSA crash file (reported crashes of trucks over 10,000 lb) and NHTSA FARS (fatal crashes). It reports the numbers without guessing at reasons.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Naugatuck Valley Planning Region
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| I-84 | 8 |
| East Main St | 1 |
| Echo Lake Road | 1 |
| SR-4 | 1 |
| SR-69 | 1 |
| SR-72 | 1 |
| SR-73 | 1 |
| South St | 1 |
| Ts-Lakewood Rd | 1 |
| US-6 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Naugatuck Valley Planning Region) |
|---|---|
| I-84 | 83 |
| Bank St | 29 |
| SR-8 | 25 |
| Main St | 16 |
| Highland Ave | 10 |
| North Main St | 9 |
| I 84 East | 7 |
| Exit 25 I 84 | 7 |
Plymouth at a glance
| Population | 11,879 |
| Land area | 21.9 sq mi |
| Density | 543 per sq mi |
Historical data: truck crashes in Naugatuck Valley Planning Region 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 | 78 | — | 0.0 |
| 2000s | 98 | +27% | 1.8 |
| 2010s | 116 | +18% | 2.4 |
| 2020s | 172 | +48% | 1.6 |
In the 1990s about 78 truck crashes a year were reported; in the 2020s, about 172. Reporting coverage also changed between these periods. NHTSA counts 3.2 fatal large-truck crashes a year in 2016–19 and 1.6 a year in 2020–24.
Nearby places
Questions fleets ask about Plymouth
How common are truck crashes in Plymouth?
Since 2015, 1,924 crashes involving commercial trucks were reported in Naugatuck Valley Planning Region (679 injured, 37 killed).
Where do fatal truck crashes happen most in Plymouth?
NHTSA data shows I-84 with 8 fatal large-truck crashes within 10 miles of Plymouth since 2015, the highest of any road.
When do most truck crashes happen in Plymouth?
The worst month is October: 10.5% of truck crashes in Naugatuck Valley Planning Region happen then.
How many garbage truck crashes are there in Plymouth?
Since 2015, Naugatuck Valley Planning Region has reported 46 garbage-truck crashes, or 2.4% of its truck crashes.
How do truck crashes in Plymouth compare with Connecticut?
The yearly rate is 35.5 truck crashes per 100,000 residents in Naugatuck Valley Planning Region, vs 40.2 for Connecticut.
How can I plan a safer truck route in Plymouth?
Paste your stops into the free CurbWaste Route Planner: it scores your route against fatal-crash locations, suggests safer alternatives and flags low bridges.
2026 is a partial year. Updated October 2026.