I get in to any vehicle , old or new , car or plane , makes no difference.
Attempt to cross a border in to the next sim , usually sandboxes or somewhere I know scripts and things will work so thats not the problem,
I lose all control of the vehicle and am unable to stand up from the vehicle , teleports fail , often I cant see my avatar and can be thrown to all kinds of crazy co-ordinates. The only way out is to relog.
One particular vehicle (tardis),I can sometimes teleport while this happens and eventually after teleporting loads of times and hammering the stand up button I can get out of it but it takes a long time and a relog is much quicker.
This happens about 9/10 times so crossing borders is a nono for me in vehicles.
I know its never been great in vehicles but i used to have much better success rates , I have a more powerfull computer now and better internet connection so I think its something on the SL side thats changed.