Resting the camera on the dashboard of the car to keep it relatively stable would be a good approach. Then it's just the car's movement and the cars outside that will create the blur and not camera shake. This will have to be experimental as far as shutter speeds and exposure are concerned. Obviously night time would work best if I am going to record light streaks. The camera pointing at back seat and kids with blur outside?
light capturing movement in its purest form. by olafur eliasson. Perhaps something that would light up like a light sculpture at night but represent something figurative during the day, something enveloping or something like an oak leaf