DAYTON, Ohio (WDTN) — The National Transportation Safety Board (NTSB) held a press conference on Wednesday, Nov. 15 to discuss a crash on 1-70 that took the lives of six people.

During the conference, the NTSB outlined the scope of their investigation. Investigators main priority is looking into what happened, then they will shift focus to safety moving forward.

The investigation is said to take 12 to 18 months, but a preliminary report will be released in two to three weeks.

Nine investigators will look through several aspects like road conditions, and how traffic was flowing prior to the crash. Other areas of investigation include human performance, such as driver fatigue, medical history and more.

Investigators will also look into the companies of the vehicles involved, examining compliance with state and federal regulations, as well as license requirements.

Another phase of the investigation involves the mechanical conditions of the vehicles, and past inspections. Safety was emphasized as the NTSB’s number one priority.

“Our focus is on safety. Our whole mission is based on determining how this happened, why this happened, and to prevent it from reoccurring,” said Jennifer Homendy, NTSB chair.

The organization also has a dedicated team working with the victims’ families as well as survivors throughout their investigation.