During May and June, John Shumate regularly parked his automobile on a vacant lot in downtown Philadelphia. At that time, no signs were posted prohibiting parking on the lot or indicating that vehicles parked there without authorization would be towed. On July 7, Shumate again left his car on the lot. When he returned two days later, the car was gone and the lot was posted with signs warning that parking was prohibited. Shumate learned that his car had been towed away by Ruffie’s Towing Service and that the car was being held by Ruffie’s at its place of business. Ruffie’s refused to release the car until Shumate paid a towing fee of $44.50 plus storage charges of $4 per day. Shumate refused to pay the fee, and Ruffie’s kept possession of the car. Did Ruffie’s have a common law possessory lien on the car?