As far as I can find the lawyers are trying to get the only objective piece of evidence - the cars own logs - thrown out. Claim the witnesses are unreliable at

As far as I can find the lawyers are trying to get the only objective piece of evidence - the cars own logs - thrown out. Claim the witnesses are unreliable at judging speed and are clinging to an early statement that it might have been "low speed collision". If we give them the benefit of the doubt why would they try to get rid of evidence that they were driving within legal limits? Especially when they have to deal with several "unreliable" witnesses claiming that they were driving too fast?