The demand for parking can be managed through pricing strategies. Parking pricing can be implemented at the employment site, with metered spaces on the street, in commercial parking lots, at destination lots such as shops, malls, parks, public facilities, or through a parking tax to manage demand for parking space. Charging for parking is one of the most effective TDM strategies. Pricing studies indicate that region-wide parking charges can result in a 1-5% reduction in VMT and vehicle trips (PSRC, 1994. pp. 25). In the study of individual employment site, SOP (Single Occupant Vehicle) reductions ranging from 12 to 25% after the elimination of free parking (Comsis Corporation, 1993a. pp. 4-9). Source/Reference: WSDOT, 2000, pp. 69-70.