No, our drivers are trained to work around them. And, generally, by the time the driver makes his second pass (4-5 hours later) parked cars have usually been moved to allow for a full cleaning of the driveway. If you expect to have a car on the driveway when we arrive we recommend that you make sure to place it as close to the top and side of the driveway as possible to allow the driver maximum accessibility, or to move it onto the street if possible. If not the driver will at least clear away behind where the car is parked including any snow banks left by the city plow.