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All attempts to reduce traffic and to change the modal split in favor of public transportation have failed to slow the increase of private transportation in urban areas in recent years. Therefore, urban traffic has become a major problem in many countries. One promising approach to the control of traffic demand in an efficient way is to introduce variable demand-based pricing schemes in urban areas. However, there have been few systematic field trials on the effect of road user charges on travel behavior. The MobilPASS field trial in Stuttgart, Germany, has now investigated the effect of variable road pricing charges on road users’ behavior at a level of detail that is unique. Special attention was paid to the interaction between the charging schemes and reductions in the number of trips, changes of mode of transport, route changes, and time shifts. The empirical results presented indicate that time- and route-dependent road charges have the desired results.

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