Night photography
Digital cameras made night photography so easy. With normal film you always had to calculate the right exposure (took a lot of experience) and to a couple of shots with different settings.
The fast quality control with todays digicams help a lot for that purpose.
It is important to understand, that you try to avoid movements of the camera towards the object you want to have a sharp image. A tripod helps a lot, sometimes I just put the camera on a rock, on a bag or anything which I find.
Doing the interior shots I press the camera to the roof of the car. When you want to photograph from the moving vehicle to the outside, I rest the camera on the steering wheel or, a a passenger, on a doorframe or whatever is handy.
This pic was taken with the camera sitting on the road (yes, I have to fix the second light for the number plate)
Using the available light with the camera on a tripod
Tripod again. At night and with low light the headlights should be on to avoid to have a dead looking car.
Try to avoid to use the flash

See, much better

I really prefer the available light. Looks much more natural

Interior shot: Put the camera on a long shutter speed like 1/8 and wait till you get into brighter parts of town. Tunnels are very good for this kind of photography.
Kind regards
Eberhard