Iliff Ave & Tower Rd Named Colorado’s #1 Most Dangerous Intersection

A new data study released by Denver-based Ridder Law ranks the intersection of Iliff Avenue and Tower Road in Aurora as the most dangerous in Colorado, anchoring a statewide Top 50 list in which Aurora accounts for 24 of the 50 locations. The analysis examined every reported intersection crash in Colorado from January 1, 2022 through November 24, 2025, applying a weighted Danger Score that prioritizes fatal and serious injuries over minor collisions.

Key Findings

• Aurora dominates the rankings: 24 of Colorado’s 50 most dangerous intersections sit within Aurora city limits, accounting for 1,737 total crashes, 1,357 injuries, and 24 fatalities, more injuries than Denver (272) and Colorado Springs (737) combined within the Top 50.
• Iliff Ave & Tower Rd is the state’s most dangerous intersection: The Aurora intersection recorded 2 fatal crashes, 9 serious injuries, and 63 minor or possible injuries, producing a Danger Score of 86.5.
• Lafayette’s Hwy 287 corridor produced the highest single-intersection fatal count: The intersection of Dillon Road and Highway 287 recorded 4 fatal crashes, the most of any location in the dataset.
• Marijuana-involved crashes carry the highest fatality rate: 33.33% of recorded marijuana-involved intersection crashes resulted in death, compared to 7.10% for alcohol-involved crashes; 87% of sober-driver crashes produced only minor or possible injuries.
• Speed multiplies lethality: At intersections with posted speeds of 65 mph or higher, the fatality rate reaches 7.9%, compared to 1% to 4% at speeds under 45 mph.
• Pedestrians face the steepest risk: More than 50% of pedestrian-involved intersection crashes resulted in serious injury or death, the highest severity rate of any crash type.
• Driver inexperience leads to deadly outcomes: 25% of crashes attributed to driver inexperience were fatal, the highest fatality correlation of any cited primary cause, and roughly 1 in 7 drivers in fatal crashes checked their blind spots but still failed to see another vehicle.

“The data points to a structural issue, not a behavioral one in isolation,” said a Senior Research Strategist familiar with the study. “When wide, multi-lane arterials like Havana Street, Colfax Avenue, and Mississippi Avenue are engineered for vehicle throughput rather than human survival, even routine driver errors produce catastrophic outcomes. Aurora’s overrepresentation reflects roadway design more than driver conduct.” A Lead Data Analyst added that the speed findings carry the clearest policy signal: “Once posted speeds cross 45 mph at a signalized intersection, the physics no longer forgive mistakes. The Dillon Road and Highway 287 finding in Lafayette underscores that this is not solely a metro problem; it follows the road geometry wherever highway-speed traffic meets local crossings.”

Beyond The Numbers

Intersections account for a disproportionate share of serious traffic outcomes nationally, and the Colorado findings align with a growing recognition among transportation planners that high-speed arterial design and pedestrian safety are increasingly in conflict. Aurora’s fatal-crash trend line, 28 deaths in 2022, 33 in 2023, 23 in 2024, and an annualized 24 in 2025, shows that despite a temporary dip, fatalities have not meaningfully fallen below the four-year baseline. The findings arrive as Denver and CDOT advance signal and pedestrian upgrades along Federal Boulevard, with construction scheduled for completion between December 2025 and January 2026. Whether those targeted investments translate into measurable reductions in severe crashes will be a key test case for Colorado’s broader intersection safety strategy.

Methodology

The analysis draws on raw crash data from the Colorado Department of Transportation, cleaned and geocoded by 1Point21interactive, covering January 1, 2022 through November 24, 2025. Each intersection received a Danger Score based on a weighted formula assigning the highest value to fatalities, high weight to serious injuries, and low weight to minor or possible injuries, with property-damage-only crashes excluded. 2025 data was annualized based on the daily crash rate observed through November 24 to allow year-over-year comparison. The full study, interactive map, and complete rankings are available at: https://ridderlaw.com/data-study-the-50-most-dangerous-intersections-in-colorado-2025/

About Ridder Law

Ridder Law is an Aurora personal injury law firm representing victims of car accidents, motorcycle and truck crashes, rideshare incidents, and other serious injury matters throughout the Front Range. The firm serves clients across Aurora, Denver, Arvada, Lakewood, and Thornton, with a practice focused on holding negligent drivers and insurers accountable for life-altering injuries.

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