PLATTEVILLE, Wis. -

Authorities said a driver using his cell phone on the highway was the cause of a crash Monday morning that stalled heavy traffic.

On Monday at 11:34 a.m., the Grant County Sheriff's Department responded to a report of a two-vehicle crash on Highway 151 south of Southwest Road in the town of Platteville.

According to the sheriff, witnesses said a car had just struck a farm tractor that was pulling a trailer full of liquid manure.

Callers said the southbound lanes of Highway 151 were blocked and manure was covering the highway. Investigators said that 37-year-old Matthew Bruhn, from Jefferson, was driving a 2014 Ford Mustang convertible, which was a rented car from Avis.

Bruhn had been texting and talking on his cell phone when he struck the back of the farm tractor, according to the sheriff's department.

Bruhn had just finished texting and was on the phone speaking to an employee when he looked up just as he hit the farm tractor, according to the report.

The driver of the farm tractor, Matthew Miller, 33, of Platteville, was shaken up, but refused medical treatment, officials said. Miller's tractor and manure trailer were removed by Guy's Towing.

Bruhn was treated at Southwest Hospital in Platteville for a broken finger. He was wearing his seat belt at the time of the accident, which the sheriff's department said most likely saved his life.

Assisting at the crash scene were the Platteville Fire Department & EMS, Wisconsin DNR, University of Platteville police, Precision Towing and Guy's Towing.