Investigators are going over evidence in the crash that killed a teenager and injured his brother on their way to school Wednesday morning. An accident reconstruction team is using technology to figure out exactly what happened.

Fifty-three-year-old Arthur Perina was arrested after witnesses say he drove his semi through a red light. The truck, hauling gravel, broadsided Joshua Wayland's car on Highway 50, just north of Highway 370 around 8 a.m. The 17-year-old died from his injuries.

Joshua and his 16-year-old brother Jacob were heading to Platteview High School where Joshua was a senior.

Jacob remains hospitalized at Creighton University Medical Center. His church pastor tells Channel 6 News after two surgeries, Jacob appears to be out of the woods and doctors expect to release him within a few days.

Perina drove for Kersten Trucking, which doesn't want to comment. A check of their safety record going back two years did not show any other accidents. Until Wednesday, Perina had an accident-free record.

The Sarpy County Sheriff's Department is leading the investigation into the crash. The Fatal Injury Response Team, made up of multiple law enforcement agencies, is gathering evidence to verify witness statements and to figure out if any other factors contributed.

"In the past, we'd have to go out there with roller tapes and tape measures and measure it all out by hand,” says La Vista Police Officer Ray Harrod. “Then we've got the measurements, then we'd have to come back to the department and draw it all out by hand."

For the past year, the team has had a tool to make the job quicker and more accurate. It's called the "Total Station." Measurements are entered in the field. "We come back, we can download the information that we receive from the scene into the program and we've already got the diagram," says Officer Harrod.

The evidence includes things tire marks and crash debris. Officer Harrod can't discuss Wednesday’s accident, but shows how the investigation technology works.

"That is the exact vehicle dimension-wise as in real life. With the roadway evidence, we can go ahead and find out where the vehicles were. We can also line up where the point of impact was and where they ended up."

It's a lot of physics without the human error says Officer Harrod. "You want to be very thorough, just like a homicide scene. You want to make sure you have all the evidence and all of it gathered to plug into your programs."

The investigation will take about a week. "We're not going to use this under normal fender benders. It's not time conducive."

Investigators have not yet determined if speed was a factor in the crash. Channel 6 News took its speed zapper radar to the intersection Thursday and monitored cars and trucks. Most were going the speed limit, if not under.

While investigators do their best to recreate the crash that killed Joshua, friends are comforted by something else. "He's in a better place. He had a lot of faith and it showed."

A memorial, placed by friends at the site, keeps Joshua's memory alive.

"This hasn't really hit me yet."

"It's hard."

"He just had the greatest personality."