Officials say a rollover crash in Norwalk left traffic backed up along Martin Luther King Drive Saturday afternoon.

A small box truck mounted a curb and hit both a tree and an electrical transformer before landing on its side. This led to the diesel fuel from the truck and cooling fluid from the transformer to spill onto the road, according to officials. 

Crews were called to clean up the mess and exposed wires. 

Officials say the driver of the truck is expected to be okay.