Abstract: The closure of the I-40 Bridge in Memphis in May 2021 created a major freight disruption and provided an opportunity to examine how truck traffic redistributed across the regional freeway network. This study evaluates corridor-level functional redundancy by analyzing truck activity, speed, and occupancy using 15-minute Radar Detection System (RDS) data from March 1 to September 30, 2021. Daily averages were computed for key corridors, including I-55 Bridge, I-240, I-55, and SR385, and conditions were compared across before, during, and after closure periods. The analysis measured the loss of truck activity on the I-40 Bridge and the gains observed on alternative routes to quantify redundancy and substitution patterns. Results show that the I-55 Bridge served as the primary replacement corridor, while I-240, I-55, and SR385 also absorbed part of the diverted freight demand. These findings provide corridor-level evidence of functional redundancy in the Memphis network and highlight how alternative routes supported freight mobility during a major infrastructure disruption.