23
KSI Total
2015–2025 excl. 2020
6
Fatalities
People killed
80
Visible Injuries
City streets
180
Total Collisions
City streets only
12.8%
KSI Rate
23 / 180
30.0%
Alcohol KSI Rate
vs 11.8% non-alcohol
Annual collision trend by severity
2015–2025 excl. 2020 — gap marks excluded year
Severity breakdown
All city street collisions
Collision type distribution
Count by type
Primary collision factor
Top contributing factors
Collisions by hour of day
Red=late night · Yellow=PM peak
Day of week
Volume by weekday
What vehicle hit
Motor vehicle involved with
High Injury Network Explorer
Sorted by KSI · All years 2015–2025 excl. 2020 · City streets only
Era Comparison
2015–2019 (pre-COVID) vs 2021–2025 (post-COVID) Equal 5-year windows · 2020 excluded · All metrics normalizedKSI rate per year — trend
Blue=2015–19 · Orange=2021–25
Volume per year
Crash count trend by era
Collision type — KSI rate shift
Blue=era A · Orange=era B · Higher = more deadly per crash
Primary factor — volume/year
Is the mix of causes changing?
HIN Corridor Changes: 2015–19 vs 2021–25
The Safety Story: 2015–2019 vs 2021–2025
Equal 5-year periods · 2020 excluded · Stats normalized for fair comparisonCatastrophic Post-COVID KSI Surge
+97.8%
KSI rate surged from 9.48% to 18.75% — a 97.8% increase. One of the highest post-COVID surges in Contra Costa County. Urgent systemic intervention required.
Speed: #1 Cause of Crashes & KSI
9.4% → 12.5%
Unsafe Speed is the #1 PCF in Danville with 48 crashes. Speed KSI rate: 9.4% (era A) → 12.5% (era B). Physical calming, feedback signs, and road diet evaluation are the priority responses.
CAMINO TASSAJARA: Persistent Hotspot
4 → 3 KSI
CAMINO TASSAJARA is the #1 HIN corridor with 7 total KSI (3 fatal). Remains city's highest-risk corridor.
HIN: Concentrated Risk
2 new corridors
2 new corridors emerged in 2021–25 not present in 2015–19. 4 corridors persist across both eras. Concentrated risk — targeted corridor investment is efficient.
Alcohol: Persistent Risk
20.0% → 40.0%
Alcohol KSI rate rose from 20.0% to 40.0%. At 40.0%, alcohol crashes remain 2.5× more deadly than non-alcohol. DUI enforcement must intensify.
Motorcycle Fatality Risk
42.9% → 0.0%
Motorcycle KSI rate: 42.9% → 0.0%. 9 crashes, 3 KSI. Late-night weekend concentration amplifies severity — enforcement targeting these windows is essential.
Dark KSI Improving
30.0% → 27.3%
Dark-condition KSI rate improved: 30.0% → 27.3%. 21 dark crashes, 6 KSI. Lighting improvements are working — maintain investment.
Volume vs Severity
23/yr → 13/yr
Crash volume: 23/yr (era A) → 13/yr (era B). Volume fell but KSI rate surged — severity crisis, not a volume crisis.
Top Intersection: SYCAMORE VALLEY RD & GREENBROOK DR
2 KSI
SYCAMORE VALLEY RD & GREENBROOK DR — 2 KSI (0 fatal), 3 crashes. Era A: 1 KSI → Era B: 1 KSI. Targeted intersection capital recommended.
AI-Powered Safety Insights
Multivariate patterns · Danville city streets 2015–2025 (excl. 2020) · Ranked by policy impact
Alcohol Multiplier Effect
2.5×
Alcohol KSI rate: 30.0% vs 11.8% non-alcohol. 5.6% of crashes, 13.0% of KSI.
DUI EnforcementDark Condition KSI Rate
27.3%
KSI rate in dark: 27.3% era B — 2.1× city average. 21 dark crashes, 6 KSI. LED intersection lighting addresses this directly.
Street LightingSpeed KSI Rate Surging
12.5%
Speed KSI rate: 9.4% → 12.5% era A→B. 48 speed crashes = #1 PCF. Each speed crash dramatically more deadly post-pandemic.
Speed CalmingLate Night KSI Spike
0.0%
KSI rate 0–5 AM is 0.0× higher than midday (4.8%). 0.0% of crashes, concentrated fatal risk window.
High-Severity WindowAlcohol + Dark: Compound Risk
33.3%
Alcohol AND dark: KSI rate hits 33.3% — well above city average of 12.8%. Disproportionate harm from this combination.
Compound RiskPost-COVID KSI Surge: Critical
+98%
KSI rate: 9.48% era A → 18.75% era B. One of the highest post-COVID surges in Contra Costa County. Urgent systemic intervention required.
Post-COVID SeverityCollision type × severity heatmap
Darker = higher KSI rate
KSI rate by time of day
When is each crash most likely to be fatal or severe?
Annual KSI vs total collisions
Volume declining but severity rising — the key trend
Top 5 corridors — KSI persistence
Dangerous year after year
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Showing
—
KSI
—
Fatal
—
KSI Rate
Severity
Fatal
Severe
Visible
Pain
SS4A FY2026 Implementation Grant — Project Portfolio
Three plans based on 2021–2025 post-COVID crash data · May 26, 2026 deadline
HSIP Cycle 13 — Project Recommendations
Cross-cycle C8–C12 analysis · Danville award history · 2021–2025 crash data
$5M–$18M est. portfolio
HSIP Grant Intelligence Module
Synthesized from Cross-Cycle Analysis C8–C12 · Countermeasure Trends · C12 Report & Funded Projects List
$0.54M
Danville HSIP Won
C12
1
Projects Funded
Prior award cycles
$1.15B
Program Total
1,281 projects C8–C12
$5–18M
C13 Portfolio Target
6 recommendations
Danville HSIP Application History
C13 Statewide Intelligence
🚀 Rising Countermeasures (C8→C12)
Gaining frequency & funding — prioritize for C13
LPI: 0→33 projects · +33
RRFB/Beacons: 11→57 · +46
Retroreflective Backplates: 1→23 · +22
Class IV Bike Lanes: 14→31 · +17
Raised Medians: 8→19 · +11
📉 Declining Countermeasures
Losing funding share — supplement but don't lead with these
Signal Timing Only: 45→12 · -33
Striping/Delineation Only: 28→9 · -19
Guardrail: 22→8 · -14
Rumble Strips Only: 11→4 · -7
BCR Sweet Spot
$1.5M–$4M
Danville should target $1.5–3.5M per BCR application. Stack 3+ countermeasures for highest BCR score.
Best Win Strategy
3-CM Stack
C12 winners averaged 3+ countermeasures per application. Prior C12 wins provide competitive positioning.
VRU Pool
57 VRU
17 ped + 40 bike = 8 KSI. Qualifies for VRU Special Rule set-aside.