A tanker truck carrying 10,000 gallons of gasoline rolled over on Route 195 in Swansea about 5:40 a.m. yesterday, spilling some of its contents and snarling traffic in both directions for most of the day as the Massachusetts State Police closed the interstate between Exits 2 and 3.

The driver was not injured, and no other vehicles were involved in the accident, said Sgt. Timothy Finn.

Traffic was detoured onto Route 6 as hazardous-materials crews worked to clean up the spill.

The westbound highway was reopened late yesterday afternoon. Two of the eastbound lanes were reopened by 9:30 last night.

The truck was eastbound when it rolled over near the Maple Avenue overpass. The tanker landed on its side in the woods by the highway, spilling an estimated 200 gallons of gasoline, said Finn. The nearest house was a safe distance away, about a quarter of a mile, so no evacuation was necessary, he said.

The road was closed at about 6 a.m. as a precaution against a possible explosion.

Hazardous materials teams from several area fire departments responded to the scene, said Finn.

The tanker belongs to Cape Cod Gas and the cab is owned by KDK Enterprises, of Wareham, Mass.

The police did not immediately release the driver’s name.

—Staff reports