RELiYOO cushions works reliably in different situations, such as in the car. If you are travelling in a vehicle made to be used while seated in your wheelchair you can use your RELiYOO cushion as usual.
However, it is important to read up on national regulations if you are planning on driving a vehicle. For example, in Switzerland the use of any cushion is not recommended for the driver, for risk of interference with safe operation of the vehicle.