TNC Trip Effects on Parking Occupancy (IMAGE) Portland State University Caption This figure shows the non-linear nature of the association between parking occupancy and TNC trips: The positive relationship between TNC trips and parking occupancy peaks and then dips. (Solid vertical lines indicate the mean number of TNC trips observed in the data. Dashed vertical lines represent the maximum observed number of trips in the data; displayed curves to the right of the dashed vertical lines represent projections based on model results.) Credit Image by Benjamin Clark and Anne Brown, NITC Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.