This, put into the floor or block of wood. Drive up to it, just till you tap it. Then stop. Resist the urge to back up.
Edit - I changed from a driveway marker image to my 'in the wild' image from my garage. I made 2 of these, and have used both for 10+ years. It's positioned to both protect the steps from getting smashed and to allow enough clearance to walk in front of the car.
