A four-vehicle chain-reaction crash shut down westbound Loop 101 in Scottsdale for hours before dawn Sunday, seriously injuring at least one person after a driver suspected of DUI slammed into vehicles that had already stopped on the shoulder to help a disabled car. First responders were called to the scene near Scottsdale Road around 1:30 a.m.
According to Arizona's Family, the trouble began when a vehicle broke down on the right shoulder of westbound Loop 101, according to the Department of Public Safety. A relative of the disabled car's driver pulled over to help, parking behind the stalled vehicle, DPS said. A third vehicle then struck the parked car, and moments later a fourth vehicle rear-ended that third vehicle, triggering the chain-reaction crash, per DPS.
DPS says the driver accused of hitting the stopped vehicles is now under investigation for DUI. At least one person was seriously injured, according to DPS, though the total number of people hurt remained unclear as of the report. Several westbound lanes stayed closed for hours before reopening around 7:30 a.m.
A Freeway Corridor With a Troubling Pattern
This is not the first time a stopped or disabled vehicle situation has turned deadly along this stretch of freeway in Scottsdale this year. Just over a month before Sunday's crash, a single-vehicle collision on July 30 sent a pickup truck into the median wall near Via de Ventura, sparking a fire that shut down southbound Loop 101 for hours and left the driver seriously injured, as reported by 12News.
In June, another serious crash and vehicle fire on northbound Loop 101 near Thomas Road killed one person and forced an extended multi-lane shutdown during the evening commute, as Hoodline previously reported. Together with Sunday's crash, the incidents point to a recurring problem of severe collisions and extended closures along this particular freeway corridor.
What Arizona's Move Over Law Requires
Arizona law places specific obligations on drivers who approach vehicles stopped on a freeway shoulder. Under Arizona Revised Statutes § 28-775, known as the Move Over law, motorists approaching a stationary vehicle with flashing hazard or warning lights on a multi-lane freeway must either change lanes to yield the right-of-way or slow to a safe speed if changing lanes isn't possible, according to the Arizona Department of Public Safety. Violations carry civil penalties starting at $275 for a first offense, rising to $500 for a second offense within five years and $1,000 for a third, per Safe Roads AZ.
If the driver accused of striking the stopped vehicles is ultimately charged and convicted of DUI, Arizona law sets a strict bar. Under Arizona Revised Statutes § 28-1381, a driver can be found guilty of DUI for being impaired to the slightest degree by alcohol or drugs, or for registering a blood alcohol concentration of 0.08% or higher within two hours of driving, according to the Arizona State Legislature. A first-time misdemeanor DUI conviction carries mandatory penalties that include at least 10 days in jail, with up to nine days suspended upon completion of alcohol screening, fines and assessments exceeding $1,250, a 90-day license suspension, and a mandatory 12-month ignition interlock device, according to Arizona Department of Transportation guidance.
Impaired Driving Remains a Persistent Threat Statewide
Sunday's crash, occurring around 1:30 a.m. on a weekend, fits a pattern documented in state crash data. Alcohol impairment contributed to 334 traffic deaths in Arizona during 2025, accounting for 28.9% of all traffic fatalities statewide, with male drivers aged 25 to 34 the demographic most frequently involved in impaired driving crashes, according to Arizona Department of Transportation data reported by the Daily Independent. Nearly 44% of all alcohol-related crashes in the state during 2025 happened during late-night and weekend hours, the same outlet reported.
Statewide, traffic fatalities actually declined for a third consecutive year in 2025, dropping to 1,156 deaths, a 5.2% decrease from 2024, even as total crashes climbed to 118,052 and overall fatalities stayed near historical highs, according to the Arizona Department of Transportation. Maricopa County, home to Scottsdale, accounted for 72.7% of all traffic collisions in the state and more than 51% of Arizona's alcohol-related traffic fatalities, per ADOT's 2024 Motor Vehicle Crash Facts report.
DPS has not released the injured victims' identities or confirmed additional details about the extent of injuries beyond the one serious injury reported. Whether the driver under investigation will face DUI charges, and what the final count of injuries will be, remain open questions as investigators continue their work.
