A box truck carrying industrial floor-cleaning supplies rolled over Wednesday morning on Interstate 19 near the exit for Tubac.
The truck, traveling south, went through the median and rolled onto its side in the northbound lanes shortly before 8 a.m., Officer Raul Molina of the Arizona Department of Public Safety said in a news release.
DPS hazmat officers responded to the crash.
The truck driver refused treatment.
Northbound lanes were blocked for several hours.