WELLS – Maine State Police have asked a judge for a search warrant to inspect a delivery truck involved in last week’s fatal accident on the Maine Turnpike in Wells.

The truck was at the rear of Friday’s chain-reaction collision that killed Dale Caverly, 27, of Clinton.

Caverly was driving a pickup truck that was in front of the Portland News Co. delivery truck driven by Laura Morse, 56, of Scarborough.

Police are looking into how the approach to the construction area was marked.

One witness said she saw no signs indicating that traffic had stopped ahead.

Turnpike authorities, however, said a turnpike engineer reported that signs were in place Thursday night and again Friday, after the accident.

“We know where the vehicles were,” said Stephen McCausland, a state police spokesman. “We do not know at this point who hit who and in what order.”

McCausland said police were seeking a warrant based on the recommendation of the District Attorney’s Office. No charges have been filed.

Also on Monday, police investigators inspected one of the four trucks involved in the collision.

The accident occurred around 2 a.m. Friday. Traffic in the northbound lane was halted while construction crews placed a beam on a new overpass near the Wells-Kennebunk town line, between Exits 2 and 3.

The pickup and the delivery truck struck the rear of a fish truck.

Caverly was rear-ended by the delivery truck and smashed into the back of the fish truck. His truck was crushed between the trucks, buried underneath the frames of the larger trucks.

Police said Caverly was killed instantly.

Morse was in satisfactory condition Monday at Maine Medical Center in Portland.

The driver of the fish truck was treated and released. The driver of the tractor-trailer truck in front of him was not injured, although his vehicle was damaged.

Portland News Co. is the state’s largest distributor of magazines, newspapers and other periodicals. It is not affiliated with the Portland Press Herald. Latasha Carman, 23, of Portland said she never saw any signs indicating that traffic would be stopped for the road closure.

She said she thought the truck in front of her was moving slowly as she came over a slight rise in the road. She didn’t realize the fish truck had stopped until she got closer.

From glancing in her rearview mirror, Carman saw that a vehicle was rapidly bearing down on her from behind. She pulled out of the lane and avoided being sandwiched between the trucks.

Maine Turnpike Authority spokesman Dan Paradee said Cianbro, the construction company working on the overpass, was responsible for signs and lane closures.

“Every indication we have is that [the required signs] and more were in place,” Paradee said.