A semi carrying a load of gravel tipped on the Broken Arrow Expressway in the eastbound lanes just before 3:30 Monday afternoon.
It happened near the Highway 169 junction.
KRMG listeners report traffic is backed up.
Drivers are urged to avoid the area and locate an alternate route, especially through rush hour traffic.
Traffic is being diverted to US-169.
The closure is expected to last several hours.
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