We plan, design, build, and maintain modern infrastructure that uplifts all communities of Los Angeles County.
Los Angeles County's new Transportation Impact Analysis (TIA) Guidelines utilizing the Vehicle Miles Traveled metric are available here.
Please note TIA Guidelines Page 7 of 34 has been updated as of 9/2/2020.
If you have any questions about the TIA Guidelines, please contact:
Please see the links below for reports referenced in the TIA Guidelines.