ZIP 94028 (Portola Valley, CA) truck route planning & crash data
Plan safer truck routes around ZIP 94028: commercial truck and garbage truck crashes here and in San Mateo County, dangerous roads, seasonality and route safety data for fleets.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
7.5 deaths per 100 garbage-truck crashes vs 2.7 for all trucks.
Deadliest roads
How San Mateo County compares with California
San Mateo County against California and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where San Mateo County stands out
Full comparison
| Measure (2015–2025) | San Mateo County | California | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 15.7 | 33.2 | 49.7 | 53% below the state |
| Deaths per 100 crashes | 2.7 | 3.6 | 3.4 | 25% below the state |
| Injuries per crash | 0.47 | 0.44 | 0.49 | same |
| Garbage-truck share | 3.1% | 1.6% | 2.3% | 1.9× the state |
| On snow, slush or ice | 0.0% | 0.9% | 6.2% | 100% below the state |
| Morning rush (6–10 am) | 28.0% | 23.5% | 23.7% | 1.2× the state |
| In rain, sleet or snow | 6.6% | 6.5% | 13.8% | same |
| Winter months (Nov–Mar) | 39.0% | 40.2% | 41.9% | same |
| After dark | 22.3% | 29.1% | 24.8% | 23% below the state |
Compared with California, San Mateo County is lower on crashes per 100k residents / yr, deaths per 100 crashes and on snow, slush or ice. Where it is higher: garbage-truck share and morning rush (6–10 am).
What stands out in San Mateo County: 1 in 32 of truck crashes here involve garbage trucks: 3.1%, vs 1.6% in California.
Overview
Police reported 1,319 crashes involving commercial trucks in San Mateo County since 2015: 630 people were injured and 36 were killed.
In complete reporting years that works out to about one truck crash every 3 days.
When crashes happen
The worst month is June with 10.8% of truck crashes; the quietest is May at 6.7%.
November through March accounts for 39.0% of truck crashes here, compared with 40.2% in California.
More truck crashes happen at 8–9 am than at any other hour (8.4%).
Snow, slush or ice was on the road in 0.0% of truck crashes, compared with 0.9% in California.
Where crashes happen
Within this area, US-101 had the most fatal crashes involving a large truck since 2015 (7). After it: I-280 (2), SR-84 (2) and Black Mountain Rd (1).
Garbage & waste trucks
Garbage and refuse trucks were involved in 40 crashes, 3.0% of the total, against 1.6% across California.
The most garbage-truck crashes happen in September (18%).
Per 100 crashes, garbage trucks recorded 7.5 deaths compared with 2.7 for all trucks.
Route planning tips for ZIP 94028 fleets
- Plan June schedules with more margin; it is the worst month for truck crashes in San Mateo County.
- Check whether your routes use US-101, the road with the most fatal truck crashes in this area.
- Garbage-truck crashes here peak in September; review collection routes for that month.
- 28.0% of truck crashes happen between 6 and 10 am, above California; consider earlier or later starts where possible.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
About the data
Crash counts come from the FMCSA crash file (police-reported crashes involving trucks over 10,000 lb); fatal-crash locations come from NHTSA FARS. Text on this page states only what these numbers show.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in San Mateo County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| US-101 | 7 |
| I-280 | 2 |
| SR-84 | 2 |
| Black Mountain Rd | 1 |
| Broadway St | 1 |
| Canada Rd | 1 |
| Crestview Dr | 1 |
| Grant Rd | 1 |
| Pulgas Av | 1 |
| SR-82 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (San Mateo County) |
|---|---|
| Us-101 N/B | 15 |
| Us-101 S/B | 9 |
| Rt92/.3M E Rt35 | 4 |
| Rt92/3.6M E Foster City Bl | 4 |
| Sr-92 E/B | 4 |
| Woodside Rd/Broadway | 3 |
| SR-1 | 3 |
| Rt92/100Ft W Pilarcitos Creek Rd | 3 |
ZIP 94028 at a glance
| Population | 6,531 |
| Density | 146 per sq mi |
| Median household income | $250,001 |
| Median home value | $2,000,001 |
| Home ownership | 82% |
Waste facilities and haulers nearby
Historical data: truck crashes in San Mateo 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 | — | — | 2.8 |
| 2000s | 77 | — | 2.2 |
| 2010s | 115 | +49% | 2.2 |
| 2020s | 102 | -11% | 2.2 |
From the 2000s to the 2020s, yearly reported truck crashes went from 77 to 102. Some of the change may reflect how crashes were reported. Fatal large-truck crashes: 3.8 a year in 2016–19, 2.2 a year in 2020–24.
Nearby ZIP codes
Questions fleets ask about ZIP 94028
How many truck accidents are there in ZIP 94028?
San Mateo County has had 1,319 reported truck crashes since 2015, injuring 630 people and killing 36.
Where do fatal truck crashes happen most in ZIP 94028?
Since 2015, US-101 has had the most fatal large-truck crashes within 10 miles of ZIP 94028: 7.
Which month has the most truck crashes in ZIP 94028?
Truck crashes in San Mateo County peak in June, with 10.8% of the year's crashes.
Are garbage truck crashes common in ZIP 94028?
Since 2015, San Mateo County has reported 40 garbage-truck crashes, or 3.0% of its truck crashes.
How does ZIP 94028 compare with California for truck crashes?
San Mateo County records 15.7 truck crashes per 100,000 residents a year, against 33.2 across California.
What is the best way to plan truck routes in ZIP 94028?
The free Route Planner takes your stops and returns a route risk score, safer alternatives and low-bridge warnings.
2026 is a partial year. Updated October 2026.