Interstate 17 has reopened after being closed for nearly nine hours on Sunday.
Transportation and public safety officials closed the highway after a major pileup north of Black Canyon City. The crash was one of two serious incidents on the highway between Sunset Point and the Valley. Earlier in the day, a deadly motorcycle crash briefly closed the I-17 in New River.
The Arizona Department of Public Safety said the Black Canyon City crash happened in the area of milepost 246 around 1:22 p.m.
According to troopers, ADOT crews were in the area taking down signs warning about an earlier crash farther south on the I-17, so drivers began slowing down for crews.
Troopers said the crash started when a commercial cattle hauler was unable to stop and crashed into dozens of cars.
The trailer rear-ended or side-swiped 24 passenger vehicles, according to DPS spokesman Raul Garcia.
However, authorities said a total of 17 people were hurt, including four who had to be flown from the scene by helicopter with moderate to serious injuries.
Officials closed the interstate at Sunset Point and were turning drivers around.
I-17 SB is CLOSED at Sunset Point. Traffic is being turned around there. There are very long delays on I-17. Please use an alternate route.
— Arizona DOT (@ArizonaDOT) October 23, 2016
For alternate routes, ADOT recommends drivers take SR 69 or SR 169, while heavier and more commercial traffic should take SR 260 east to SR 87 south.
Alternate routes to Phx on I-17 SB: SR 260 EB to SR 87 SB. This route is best for semis. If in a passenger vehicle, u may use SR 69 or 169.
— Arizona DOT (@ArizonaDOT) October 23, 2016
Officials said the truck was hauling 80 calves, which were unhurt in the crash. The interstate was expected to reopen around 9 p.m. at the earliest, according to DPS.
Investigators are working to determine why and how the truck failed to slow or stop, causing the crash.
Even with the roads reopening just before 10 p.m., officials said it would take some time for the traffic backup to clear.
Check latest traffic conditions HERE.