A problem of traffic demand modeling is that it is a self-fulfilling prophecy due to the Induced demand. If you project more traffic demand and build more roads and add more lanes, then people would use it more and more homes will be built along the corridor, increasing the traffic volume.

Failures#

• Denial and declining traffic on the I-5 bridges
• 청계천
• Barcelona? Spain?

See also#

• Problems with traffic projection—Rose Hill Drive case study and the self-fulfilling prophecy problem
• Induced demand
• Traffic evaporation