This would be my first public release of this mod.
Download link: http://www.klankaos.com/downloads/Vehicles.zip (v 1.6)

Vehicles it contain:
U_Vehicles.Jeep (mesh by Jojje)
U_Vehicles.CivilCar
U_Vehicles.SportsCar (mesh by []Pcube[])
U_Vehicles.MicroSportsCar
U_Vehicles.TigerTank
U_Vehicles.SkaarjHoverJet
U_Vehicles.SkaarjSpaceJet
U_Vehicles.AirShip (mesh by Kajgue, aka. Ice-Lizard)
U_Vehicles.Submarine
U_Vehicles.UFO (idea by SoulRaver)

And VehicleFactorys (respawn points for vehicles):
U_Vehicles.JeepFactory
U_Vehicles.TigerFactory
U_Vehicles.SkaarjHoverJetFactory
U_Vehicles.SkaarjSpaceJetFactory
U_Vehicles.AirShipFactory
U_Vehicles.SubmarineFactory
To change their spawning vehicle class you can type "Admin set <Vehicle Factory> VehicleClass <some vehicle class>".
To change respawntime for the vehicles type "Admin set <Vehicle Factory> VehicleRespawnTime <time in seconds>".

Updates on v1.6 on VehiclePhys:
*Fixed "nocanfire" online bug on UT.
*Added bumping/crashing sounds.
*Made running into other vehicles and monsters/players a little bit more realistic.

Updates on v1.5 on VehiclePhys:
*Fixed velocity replication on vehicles (when they move slowly that they arent "jumping" around that much).
*Fixed that on UT'99 CTF player drops the flag on enter a vehicle.
*Fixed that UT'99 arena mutators cant replace Driver's Weapon.
*Added full Quaternion math functions (special thanks to UnrealWiki for this).
*Using Quaternion I fixed the wheels "tilting" error on slopes.

Updates on v1.3 on VehiclePhys:
*Fixed a movement glitch on Wheeled car physics (when you accelerate in 1 direction, then hit deaccelerate it would turn around and keep moving in same speed).
*Fixed some memory leaks on vehicle base class.
*Improved physics on hills for Wheeled cars and Tread crafts (so they drive slower up on huge slopes while they move faster down the slopes).
*Fixed a bit the bot AI on AirShip, Submarines and Chopper crafts.

Updates on v 1.2 on VehiclePhys:
*Added better steering for wheeled vehicles.
*Fixed minor glitches.
On U_Vehicles:
*Added missing mesh for Jeep.
*Added inside view for Jeep and CivilCar.
*Fixed network bug on Airship mortars.

Updates on v 1.1 on VehiclePhys.u:
*Fixed the minor conflict with xCoop.
*Fixed that player can not switch seat to a non-excisting passenger seat.
*Fixed that player can not swap seat with other players (only bots).
*Fixed an aiming error with bots.
*Fixed that bots will still fire even if vehicle itself dosent face straight toward enemy.
*And some other minor things I can't remember.

Heres full version of the 3 Unreal 2 vehicles now:
U2Vehicles.Raptor
U2Vehicles.Juggernaut
U2Vehicles.Harbinger
U2Vehicles.Bulldog
U2Vehicles.RaptorFactory
U2Vehicles.JuggernautFactory
U2Vehicles.HarbingerFactory
U2Vehicles.BulldogFactory
Download from here: http://www.klankaos.com/downloads/U2Vehicles.zip (v 1.1)

Changes on U2Vehicles v 1.1:
*Added Bulldog from UT2003.
*Fixed a script warning flaw on Raptor.
*Gave all the vehicles better exit offsets so you dont get run over by the vehicle when you exit it.

P.S: Not to worry, I will still make new version(s) over this to fix some possible bugs.

Nice work.

I still have some suggestions, let me know if you agree:

The Raptor: Nice to see the model in, even with rotating wheels. In u2XMP the raptor is much smaller and a bit faster. It is meant as the quickest vehicle with relatively low armor and medium firepower.

The juggernaut (u2 tank) is much larger, quite slow and has good firepower.

Extra features (low priority of course) The raptor has a grinder which hurts (gibs) unfortunate pedestrians. Cannons can be controlled with mouselook.

Bug: Sometimes when you exit a vehicle, I was unable to move.

Ok.. it has been confirmed that this vehicles mod does not work very well on current version of xCoop, due to something keeps enabling player collision on that mod again (which means vehicle will run over the driver whenever vehicle bumps into something).

@ Hyper.nl, I'd rather not change the scale becouse then I'd have to figure out all coordinates and stuff again, but I can make the vehicle faster. As for the grinder, I think I'll leave that out for now becouse I'd require some good quaternion functions to get the rotation for it correct (and Unreal Wiki seams to be down so I don't get much help from that for now).

Updated the both files now and put in "full" version of the U2 vehicles now including the 3 vehicles (Juggernaut, Raptor and Harbinger).

@Dots: Nice work on the u2vehicles. I like the sounds.
@Primeval: Press throw weapon key to get out of vehicle

But why not the Return key as usual in all Unreal games? And why not adding Mantas and Leviahtans? Oh, and Goliaths?
By the way, any chance to get this working on UT99?

UnrealWiki is back on!
UT2003 has only one vehicle then? Bulldog buggy? And is it included here?
I wonder where will the vehicles be used, ONS for U1 probably, UT might use that too... But not Vehicle CTF yet I guess (if it is made in U1 and UT), and not for deathmatches or it would need to refer that you need to have a special package. But still nice.
So why not Return (Enter) key? And maybe it should be configurable from the Options list?

If you could actually convert UT2004 vehicles, it would really be cool, even if it takes longer.

EDIT: Hmm, how do you use it? I can't locate it by opening package in UEd.
EDIT: the code "Summon U2Vehicles.Raptor" doesn't work for me in Assault, not tested anywhere else yet.

And so I made another update for all 3 packages (the both downloads). I even included the UT2003 Bulldog with U2Vehicles package now (almost an overpowered vehicle; which shoots homing missiles, has 1.6K health and can squish other players just like bloblets).

No, not working for me in my UT... It stops for a sec like it would be loading a non-precached package, but nothing appears and I don't see anything.

EDIT: Quite off-topic, but as you have converted U2 vehicles, would it be possible to convert U2 weapons to UT or U1? They are really unique and fun, all reloadable, but there are reloadables in both (in UT it shows the clip size - maybe it could show it in U1 as well?), so it wouldn't be much of a problem, and I don't think it uses any fancy technique (only the missles can be somewhat fancier, like the Shock Lance's primary).
If UT had U2's vehicles, U2 weapons, and it can already be merged with U1 and U1:RtNP, it would be a beaster than ever game! I've never seen a game so compatible with others, but mods are things that attracted many players in the first place

No, that was not mentioned there You should make 3 zips then.
I'll try that out tomorrow, and I've updated the post before, look it up. U2 weapons would be a blast!