Transcript for California Bus Crash: Authorities Stage Re-enactment of Accident
This is a special group. Hello I'm Michelle Franzen in New York all -- this hour on California where Highway Patrol officers are releasing. 911 recordings from the aftermath that the fiery bus crash that killed ten people last week. And began in a reenactment. Of the collision we -- joined now from Washington by the former chairman of the National Transportation Safety Board Jim Hall thank you for joining us. -- -- -- this investigation now does it get any easier or more difficult for investigators to figure out what happens as time goes by. Well there's a lot of information this is a very significant accident. Both from the standpoint -- Tanzania. Federal express -- and its operation. Along with the motor coach. That was hit it and issues important safety. Egress issues around that. -- they just finished a press conference a short time ago they are in the process of releasing those 911 calls. Investigators are also set soon to stage -- re an enactment of that accident -- that's an idea. How that can help aid in this investigation in addition to what they've already learned from the scene. Well it's it's very important. Trot -- recreate. What -- Carter. So you can understand it and put various facts that you gathered during investigation and in context. We always try to do that did the same time -- the -- -- today. -- weather conditions. So that. You you have a pretty good the what was happening the time the accident are the best you can recreate it. But here's chief -- -- discussing what he believes he owes the families of the people who died last week. I think it's important. Did to know that we owe it to the families of the involved parties. And the victims this tragic collision. That we tell the story of what happened. And that we talent is accurately as possible and that's what the California Highway Patrol will be doing. How important is it for. The law enforcement and the investigators to keep families informed and involved. Well. After TWA 800 week but President Clinton sounds friendly assistance act which it aviation makes that a statutory requirement. But it is the responsible thing for anyone that is involved an accident investigation. To do to be sure of that. Those who are our most impacted by this tragedy. Are tragic of -- Have the information. As soon as possible so they can assemble -- did. And understand. As the investigation progresses and part. Investigators are currently there are currently interviewing passengers. And potential witnesses and continually being. Continuing to find. -- -- Witnesses is it typical -- that there would be new witnesses coming forward still at this time a week after. -- yes. You know a lot of people that. See something man. Doesn't register and -- Read the newspaper. Accounts and -- understand the significance and then come forward. But I think one of the things it's important to note here is. Unique to our country how our law enforcement -- the NTSB. How we're conducting parallel investigations both with important missions. And both at a very cooperative fashion. And both most importantly. With the best interest of the families and. And along with of course those in mind. The Highway Patrol officers are also releasing emergency calls from just after the -- how does making that public stand to benefit the investigation. Well its -- and exercise and good public policy. And it. Underscores the importance. Our emergency response it's responders. And those who are at the end of these 911 calls. When an event like this happens. Their pulled into the tragedy. They're the first people -- -- the tragedy. And that it's important to have that information out there. To put the whole amendment context. To those eyewitness sort of accounts helped shape the investigation. Well they can. You know many times our witnesses. Kids see things. Our report that use. More more on what they've -- and suggestions and and that this then they're actual. -- -- The most important. I don't. And particularly aviation taxes. Is a black box and we're we're saying that now. In. On the highways and motor vehicle accident investigations. And that is really the factual information. That the investigators looked it. The Highway Patrol course -- the NTSB -- working together here sharing information but they also have different goals what are the NTSB. Investigators. Looking for -- focusing on. Well. -- -- How the federal regulations state regulations. Have worked in the situation. Everything from. -- -- the how way the design of the vehicle to the how the operators. Handle -- vehicles. Who the NTSB does is very deep dobbs. In regard to trying to look at the whole. Accident. To blame any thing that could be changed. In the area transportation safety that would prevent an event like this from. -- Certainly we will wait to see what they find out from the 911 tapes and of course the reenactment Jim Hall former chairman of the National Transportation Safety Board thank you. Thank you. This has been an ABC news digital special report keep up with this investigation real time by downloading the ABC news that. And starring this story for exclusive updates on the go for now on the -- France and the New York.
This transcript has been automatically generated and may not be 100% accurate.