Why, AZ truck route planning & crash data
Plan safer truck routes in Why: commercial truck and garbage truck crashes in Why and Pima County, dangerous roads, seasonality and route safety data for fleets. Patterns use Pima County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
9.8 deaths per 100 garbage-truck crashes vs 6.7 for all trucks.
Deadliest roads
No fatal large-truck crashes with a road name recorded here since 2015.
How Pima County compares with Arizona
Pima County against Arizona and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Pima County stands out
Full comparison
| Measure (2015–2025) | Pima County | Arizona | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 18.5 | 35.9 | 49.7 | 48% below the state |
| Deaths per 100 crashes | 6.7 | 5.2 | 3.4 | 1.3× the state |
| Injuries per crash | 0.17 | 0.19 | 0.49 | 11% below the state |
| Garbage-truck share | 1.9% | 1.6% | 2.3% | 1.2× the state |
| On snow, slush or ice | 0.4% | 3.2% | 6.2% | 87% below the state |
| Morning rush (6–10 am) | 25.1% | 22.6% | 23.7% | 1.1× the state |
| In rain, sleet or snow | 4.9% | 5.3% | 13.8% | 8% below the state |
| Winter months (Nov–Mar) | 44.3% | 42.1% | 41.9% | same |
| After dark | 25.3% | 30.0% | 24.8% | 16% below the state |
Compared with Arizona, Pima County is lower on crashes per 100k residents / yr, injuries per crash and on snow, slush or ice. It stands out for higher deaths per 100 crashes, garbage-truck share and morning rush (6–10 am).
The headline for Pima County: 0.4% on snowy, slushy or icy roads, against 3.2% across Arizona.
Overview
Since 2015, 2,337 crashes involving commercial trucks have been reported in Pima County. They injured 429 people and killed 151.
Across the years with complete reporting, that is roughly one truck crash every 2 days.
Why had 0 reported truck crashes since 2015, too few for reliable patterns, so the charts and findings on this page use Pima County numbers.
When crashes happen
February has the most truck crashes, 9.5% of the yearly total, while April has the fewest (7.4%).
November through March accounts for 44.3% of truck crashes here, compared with 42.1% in Arizona.
The busiest hour is 8–9 am, with 7.3% of truck crashes.
Road surface: 0.4% of truck crashes were on snow, slush or ice (Arizona: 3.2%).
Where crashes happen
No fatal crash involving a large truck has a recorded location within 10 miles of Why since 2015.
Garbage & waste trucks
Garbage and refuse trucks were involved in 46 crashes, 2.0% of the total, against 1.6% across Arizona.
Their busiest month is April, with 17% of garbage-truck crashes.
They recorded 9.8 deaths per 100 crashes, against 6.7 for all trucks.
Route planning tips for Why fleets
- Build extra time into February routes: it has the most truck crashes here.
- Garbage-truck crashes here peak in April; review collection routes for that month.
- Morning starts matter: 25.1% of truck crashes fall between 6 and 10 am, higher than Arizona.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
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 Pima County
By hour of day
Most dangerous roads for trucks
No fatal crashes involving a large truck with a road name were recorded within 10 miles since 2015.
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Pima County) |
|---|---|
| I-10 Noncard@M264 | 36 |
| I-10 Noncard@M262 | 24 |
| I-10 Noncard@M255 | 22 |
| I-10 Noncard@M253 | 19 |
| I-10 Noncard@M252 | 18 |
| I-10 Noncard@M257 | 15 |
| I-10 Noncard@M268 | 14 |
| I-10 Noncard@M267 | 12 |
Why at a glance
| Land area | 9.0 sq mi |
| Median household income (ZIP 85321) | $53,180 |
| Median home value (ZIP 85321) | $121,706 |
Waste facilities and haulers nearby
Historical data: truck crashes in Pima 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 | 29 | — | 6.5 |
| 2000s | 173 | +494% | 7.4 |
| 2010s | 101 | -42% | 7.3 |
| 2020s | 199 | +97% | 12.4 |
In the 1990s about 29 truck crashes a year were reported; in the 2020s, about 199. Reporting coverage also changed between these periods. Fatal crashes involving a large truck averaged 7.2 a year in 2016–19 and 12.4 a year in 2020–24.
Nearby places
Questions fleets ask about Why
How many truck accidents are there in Why?
Pima County has had 2,337 reported truck crashes since 2015, injuring 429 people and killing 151.
What is the worst month for truck crashes in Why?
February has the most truck crashes in Pima County, 9.5% of the yearly total.
How many garbage truck accidents happen in Why?
46 crashes involving garbage or refuse trucks have been reported in Pima County since 2015, 2.0% of all truck crashes.
What is the truck crash rate in Why compared with Arizona?
The yearly rate is 18.5 truck crashes per 100,000 residents in Pima County, vs 35.9 for Arizona.
How do I plan a garbage truck route in Why?
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.