Corridor Typology

Four corridor archetypes based on collision pattern analysis. Each type has distinct risk factors and targeted countermeasures.

🚦

Signal-Conflict

Broadside + signal violation drives severity

Concord AveConcord BlvdClayton Rd

Countermeasures

  • ▸ Yellow/red clearance review
  • ▸ Leading Pedestrian Intervals (LPI)
  • ▸ Detection upgrades
  • ▸ Red-light camera evaluation at top broadside intersections
⚡

Speed-Severity

High speed + high KSI + dark amplification

Treat BlvdCowell RdCA-4

Countermeasures

  • ▸ Nighttime speed enforcement cameras
  • ▸ Approach lighting audit
  • ▸ Curve warning sign upgrades
  • ▸ Pavement friction assessment on horizontal curves
🚶

Multimodal Exposure

High VRU + alcohol + segment + dark severity

Monument BlvdMeadow LnGrant St

Countermeasures

  • ▸ HAWK/RRFB signals at key crossings
  • ▸ Pedestrian-level lighting retrofit
  • ▸ Behavior/education program
  • ▸ OTS Fri/Sat night enforcement 9 PM-2 AM
🔄

Volume-Conflict

High frequency, moderate severity, high H&R

Willow Pass RdPort Chicago HwyMarket St

Countermeasures

  • ▸ License Plate Reader (LPR) deployment
  • ▸ Intersection geometry review
  • ▸ Median barriers on high-speed segments
  • ▸ Signal timing audit for leading intervals