Foremost, Portugal has built its National Motorway System using PPPs. In doing so, it has kept pace with the traffic demands of its country, vastly improved highway safety and travel times, and leveraged private investment. While upgrading the quality of the motorway system probably has more to do with the improvements in safety and travel times than the implementation of performance- based PPPs, the pace of Portugal's highway development program, and thus its improved motorway quality, is directly attributable to its aggressive PPP program since 2000. Figures 18 and 19 (see next page) are telling in this regard.