A national survey by the Texas Transportation Institute of 75 urban areas in the United States showed that time spent delayed in traffic rose from an average of 16 hours per year in 1982 to 62 hours in 2000.
वाहतुकीच्या समस्येवर तोडगा काढण्याच्या नादात परिस्थिती सुधारण्याऐवजी आणखीनच बिकट झाली आहे.