Duncan, IA truck route planning & crash data
Plan safer truck routes in Duncan: commercial truck and garbage truck crashes in Duncan and Hancock County, dangerous roads, seasonality and route safety data for fleets. Patterns use Hancock County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
3 of 87 truck crashes since 2015.
Deadliest roads
How Hancock County compares with Iowa
Hancock County against Iowa and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Hancock County stands out
Full comparison
| Measure (2015–2025) | Hancock County | Iowa | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 70.2 | 68.1 | 49.7 | same |
| Deaths per 100 crashes | 4.9 | 3.5 | 3.4 | 1.4× the state |
| Injuries per crash | 0.65 | 0.41 | 0.49 | 1.6× the state |
| Garbage-truck share | 3.7% | 2.2% | 2.3% | 1.7× the state |
| On snow, slush or ice | 24.4% | 18.7% | 6.2% | 1.3× the state |
| Morning rush (6–10 am) | 24.4% | 24.0% | 23.7% | same |
| In rain, sleet or snow | 12.2% | 15.1% | 13.8% | 19% below the state |
| Winter months (Nov–Mar) | 45.1% | 45.4% | 41.9% | same |
| After dark | 15.8% | 23.1% | 24.8% | 31% below the state |
Hancock County sits below Iowa on in rain, sleet or snow and after dark. It runs above Iowa on deaths per 100 crashes, injuries per crash and garbage-truck share.
What stands out in Hancock County: 1 in 27 garbage-truck share of crashes is 3.7%, against 2.2% for Iowa.
Overview
Police reported 87 crashes involving commercial trucks in Hancock County since 2015: 54 people were injured and 5 were killed.
In complete reporting years that works out to about one truck crash every 49 days.
With 0 truck crashes reported in Duncan since 2015, this page uses Hancock County numbers for its patterns and comparisons.
67% of truck crash reports in Hancock County since 2015 leave the city field blank; place counts include only reports that name the place.
When crashes happen
The worst month is January with 12.6% of truck crashes; the quietest is April at 3.4%.
The five winter months (November to March) hold 45.1% of truck crashes, against 45.4% across Iowa.
More truck crashes happen at 12–1 pm than at any other hour (11.5%).
24.4% of truck crashes here happened on snow, slush or ice, against 18.7% across Iowa.
Where crashes happen
Since 2015, fatal crashes with a large truck within 10 miles of Duncan happened on CR-B16/310TH St (1), CR-B55/170TH St (1) and US-18 (1); no road leads clearly.
Garbage & waste trucks
Garbage and refuse trucks were involved in 3 crashes, 3.4% of the total, against 2.2% across Iowa.
Route planning tips for Duncan fleets
- Build extra time into January routes: it has the most truck crashes here.
- With 24.4% of truck crashes on snow, slush or ice (above Iowa), plan winter equipment checks early.
- Check your own stops for crash hotspots and low bridges with the free Route Planner.
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 Hancock County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| CR-B16/310TH St | 1 |
| CR-B55/170TH St | 1 |
| US-18 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Hancock County) |
|---|---|
| US-18 | 16 |
| R020/Deer Ave | 3 |
| 170Th St | 2 |
| And R018/Birch Ave | 2 |
| Ford Ave | 2 |
| Ia 17 | 2 |
| Iowa Ave | 2 |
| James Ave Measuring 585 Feet | 2 |
Duncan at a glance
| Land area | 0.8 sq mi |
| Median household income (ZIP 50438) | $70,350 |
| Median home value (ZIP 50438) | $198,472 |
Waste facilities and haulers nearby
Historical data: truck crashes in Hancock 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 | 2 | — | 0.1 |
| 2000s | 5 | +102% | 0.3 |
| 2010s | 8 | +55% | 0.4 |
| 2020s | 7 | -4% | 0.4 |
From the 1990s to the 2020s, yearly reported truck crashes went from 2 to 7. Some of the change may reflect how crashes were reported. Fatal crashes involving a large truck averaged 0.2 a year in 2016–19 and 0.4 a year in 2020–24.
Nearby places
Questions fleets ask about Duncan
How common are truck crashes in Duncan?
Hancock County has had 87 reported truck crashes since 2015, injuring 54 people and killing 5.
Which month has the most truck crashes in Duncan?
The worst month is January: 12.6% of truck crashes in Hancock County happen then.
How many garbage truck crashes are there in Duncan?
Since 2015, Hancock County has reported 3 garbage-truck crashes, or 3.4% of its truck crashes.
How does Duncan compare with Iowa for truck crashes?
Hancock County records 70.2 truck crashes per 100,000 residents a year, against 68.1 across Iowa.
What is the best way to plan truck routes in Duncan?
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.