So I guess you meant "artificial light"?
If so, you'll have to see how much light there actually is and from there decide on what would be acceptable iso to get the job done.
I suspect you'd want the cars pretty much all in focus which would mean using an aperture of about f8. If you're able to shoot 1/20s hand held you might be OK. If you bring a monopod, then maybe you can have even more Depth of Field.
It's kind of tuff to recommend settings without knowing exactly what the conditions will be. Just do your best and show us the results.
Good luck.