CAMPO documents revealed that the planning organization’s travel demand model overestimated population growth in 2020 by around 1% but underestimated growth by 8% in 2025, compared to U.S. Census data.
Greg Lancaster, CAMPO’s travel demand modeling manager, said that the CAMPO model and U.S. Census data do not perfectly match up, as CAMPO has released projections for 2015, 2025, 2035 and, most recently, 2045.
“I want you to notice over here that the travel demand model does not have a 2020 forecast,” Lancaster said during CAMPO’s Oct. 11 board meeting.
Instead, Lancaster's model assumed growth would be consistent, or linear, from 2015 to 2020, with 2045 as the base year. Similarly, for a 2025 U.S. Census data projection, he said that he used a linear growth rate.
The CAMPO projections play an important role in identifying transportation projects throughout the Central Texas region, CAMPO Executive Director Ashby Johnson said.
“[The projections] are used to give estimations of future travel demand across the region. They are used by organizations like [the Texas Department of Transportation] to make estimations of the future project need,” Johnson said. “Also, the numbers are used by Capital Metro to make estimates of future ridership demand on the transit system.”