There's a new version of the Doom 3 SDK available. This version supports both Windows and Linux and comes with vehicles. idSoftware has them for download:

• Windows
• Linux

Read on to see more about the updates as taked from the idSoftware posting.

Vehicles

Be sure to read the readme.txt in the vehicles folder

Maya Importer Source

To compile the Maya Import dll, you will need to get the Maya 4.5 or the Maya 6.0 SDK from Alias.
There is a note in the directory explaining where the files need to go. The project comes
set up to compile a dll for Maya 4.5. If you want to compile a dll for Maya 6.0,
instructions are in maya_main.cpp. For Maya 6.0, you will need Visual Studio 2003 or higher.
The Maya 6.0 SDK does not work with Visual Studio 2002.

Linux Source

TTimo put together an official release for the Linux code. The code itself is the same as windows,
but there are some different build options and an included SCons file.

Random Fixes

Including (but not limited to) compiling 'out the box' in Visual Studio 2003 and 2005

If you have already done significant work on a mod, I would recommend installing this to a clean
directory, then running windiff against your code base. Alternatively you could diff against the
first SDK and manually copy the changes over.

Just wanted to ask has any one got the vehicles to work as yet if so how.
I have done all it says in the read me I can punch them and they will move but not get in them I also put in the cfg bind enter _impulse40 and in the console with no luck I just want to do some stunts in the 2nd map it look fun.
Help please from a desperate stunt driver I just want to make the car fly over that big jump.
lol

It is ok got it to work now.
Ps what happened to the edit button?

We were finding old posts being deleted and therefore becoming useless to the forums here. So, to avoid that, you are given about 3 minutes (3 or five, I forget now) to notice an error and edit your post. Otherwise the edit button goes away.

Thanks for that I just wondered what happened to it.
Found this post very help full if you turn the car over this is part of the info on there
Bind a key toggle g_dragentity
I won’t post the rest as it is not my info to post and the rest is to make your car go a lot faster lots of fun.