I-15 Cajon Pass Freight & Crosswind Climb
At a glance: Graded 74 out of 100 (Tier 3: High-Speed Merge & Technical Canyon) across 12.2 miles in Inland Empire. Major interstate mountain pass between the San Bernardino Basin and Mojave Desert with steep truck grades, runaway ramps, and canyon gusts.
Why this corridor sits in Tier 3
Climbing more than 2,200 vertical feet between Kenwood Avenue and Oak Hill Road, I-15 through Cajon Pass mixes 70 mph passenger vehicles with heavily loaded port freight tractors crawling at 30 to 40 mph. High speed variance, seasonal Santa Ana wind gusts, and downhill brake thermal load characterize its crash profile.
Key roadway traits
- 6% sustained interstate grade
- 35+ mph truck-to-car speed differential
- High canyon crosswind exposure
Four-factor geometric & crash decomposition
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Connected highway & local crash profiles
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Other Tier 3 California corridors
Methodology & interpretation limits
Complexity Index combines horizontal curvature, sustained elevation grade, speed-transition demand, and 12-month historical reported crash concentration per corridor mile. Counts describe observational public records unadjusted for daily traffic volume and do not represent driving safety advice. Missing-coordinate collision records in surrounding cities are reported separately in live buffered queries and are never plotted at synthetic coordinates.
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