Lack of knowledge by a vehicle's registered owner that the driver to whom he loaned his car was not validly licensed constitutes a mitigating circumstance under Vehicle Code section 14602.6(b), warranting release of the vehicle to the registered owner before expiration of the 30-day storage period set forth in the statute; this mitigating circumstance exception is not limited to situations where the owner has made a reasonable inquiry as to the licensed status of the driver before lending the vehicle.