VMT Analysis of Auxiliary Lanes

 
In the 2018 SB 743 OPR technical advisory on induced travel, auxiliary lanes of less than one mile designed to improve roadway safety were included as projects that would not likely lead to a substantial or measurable increase in vehicle travel, and therefore generally should not require an induced travel analysis. As Caltrans has conducted project reviews, it appeared that further guidance on two situations involving auxiliary lanes would be useful to practitioners. The two situations addressed in this supplementary guidance are the extension of an existing auxiliary lane and multiple auxiliary lanes in the same corridor.
 
For extension of existing auxiliary lanes, the supplementary guidance suggests that the practitioner should review and fully document the rationale supporting the conclusion that a particular project would not likely lead to a measurable and substantial increase in VMT. For multiple auxiliary lanes in the same corridor, practitioners are directed to carefully assess the projects on a case-by-case basis and address the direct, indirect and cumulative effects of the transportation projects.