For years, cities throughout Texas have had a rough proportionality standard in their respective ordinances, which have been enforced to various degrees.
Authored by Dan Hennessey from BIG RED DOG with AJ Bingham from the Real Estate Council of Austin, this paper lays out the case law that created these standards, how these calculations are (and should be) completed for individual development projects, and how the City of Austin has approached this change.
Rough proportionality establishes a maximum cost of the additional traffic to the surrounding transportation system. Cities maintain that developers should pay roughly that amount to the jurisdiction to fund either specific improvements or future unidentified improvements. Developers maintain that cities can hold them responsible for no more than the rough proportionality standard.