This is the set-up I use when making road videos. Essentially, the tri-pod is set up in the passenger side floorboards with the stem of the tri-pod against
the dashboard (the legs of the tri-pod are adjustible to fit the ups and downs of the floorboard). The passenger seat is then pulled forward against the tri-pod which keeps the
tri-pod from wanting to move forward or backwards in response to acceleration and/or braking. A piece of duct tape holds the tri-pod to the dash and provides lateral stability
for the tri-pod when turning.
Then a tape is loaded and set to recording while the car is still. Once the car is in motion, I do not look at or touch the
camera untill the vehicle is safely stopped.