293
KSI Total
2015–2025 excl. 2020
66
Fatalities
People killed
510
Visible Injuries
City streets
2,058
Total Collisions
City streets only
14.2%
KSI Rate
293 / 2,058
23.2%
Alcohol KSI Rate
vs 13.0% 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 comparisonFewer Crashes, Far More Deadly
+49.1%
KSI rate rose from 11.85% to 17.67%. Volume fell but each crash is significantly more likely to kill or severely injure. A severity crisis, not a volume crisis.
Speed: #1 Cause of Crashes & KSI
10.6% → 20.3%
Unsafe Speed is the #1 PCF in Antioch with 478 crashes. Speed KSI rate: 10.6% (era A) → 20.3% (era B). Physical calming, feedback signs, and road diet evaluation are the priority responses.
LONE TREE WAY: Emerging Danger
0 → 19 KSI
LONE TREE WAY is the #1 HIN corridor with 19 total KSI (6 fatal). KSI worsening era A→B — immediate capital intervention warranted.
HIN: Danger Spreading
21 new corridors
21 new corridors emerged in 2021–25 not present in 2015–19. 19 corridors persist across both eras. Systemic citywide programs needed alongside targeted corridors.
Alcohol: Persistent Risk
19.9% → 27.8%
Alcohol KSI rate rose from 19.9% to 27.8%. At 27.8%, alcohol crashes remain 1.8× more deadly than non-alcohol. DUI enforcement must intensify.
Pedestrian KSI Rate Rising
22.4% → 36.8%
Pedestrian KSI rate: 36.8% era B. 42.7% of ped crashes in dark conditions — LED lighting and RRFB crossings are the priority response.
Dark KSI Surging
15.6% → 22.3%
Dark-condition KSI rate surged: 15.6% → 22.3%. 661 dark crashes, 122 KSI. LED intersection lighting and retroreflective backplates deliver the highest BCR return.
Volume vs Severity
243/yr → 169/yr
Crash volume: 243/yr (era A) → 169/yr (era B). Volume fell but KSI rate surged — severity crisis, not a volume crisis.
Fatal Intersection: LONE TREE WAY & BLACK DIAMOND DR
2 KSI
LONE TREE WAY & BLACK DIAMOND DR — 2 KSI (1 fatal), 3 crashes. Era A: 0 KSI → Era B: 2 KSI. Immediate capital investment warranted.
AI-Powered Safety Insights
Multivariate patterns · Antioch city streets 2015–2025 (excl. 2020) · Ranked by policy impact
Alcohol Multiplier Effect
1.8×
Alcohol KSI rate: 23.2% vs 13.0% non-alcohol. 12.6% of crashes, 20.5% of KSI.
DUI EnforcementDarkness Amplifies Severity
42.7%
Of pedestrian crashes occur in dark. After-dark ped crashes are 2.6× more likely to be fatal/severe than daytime (42.0% vs 16.0% KSI rate).
Street LightingPedestrian KSI Rate Elevated
27.8%
Pedestrian KSI rate: 27.8% across 234 crashes (65 KSI). 42.7% of ped crashes in dark — LED lighting and RRFB crossings are the priority response.
Ped InfrastructureLate Night KSI Spike
20.2%
KSI rate 0–5 AM is 1.5× higher than midday (13.4%). 0.0% of crashes, concentrated fatal risk window.
High-Severity WindowAlcohol + Dark: Compound Risk
25.6%
Alcohol AND dark: KSI rate hits 25.6% — well above city average of 14.2%. Disproportionate harm from this combination.
Compound RiskMotorcycle Danger Window
39.9%
Motorcycle KSI rate: 39.9% — 2.8× city average. 168 crashes, 67 KSI. Late-night weekend is highest-risk window.
Motorcycle SafetyCollision 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
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KSI
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Fatal
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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 · Antioch award history · 2021–2025 crash data
$6M–$18M est. portfolio
HSIP Grant Intelligence Module
Synthesized from Cross-Cycle Analysis C8–C12 · Countermeasure Trends · C12 Report & Funded Projects List
$1.60M
Antioch HSIP Won
C12
2
Projects Funded
Prior award cycles
$1.15B
Program Total
1,281 projects C8–C12
$6–18M
C13 Portfolio Target
6 recommendations
Antioch 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
Antioch 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
337 VRU
234 ped + 103 bike = 90 KSI. Qualifies for VRU Special Rule set-aside.