St. Matthew’s retains Wiltec, a licensed traffic engineering firm approved by the Los Angeles Department of Transportation, to count and report the number of cars entering campus in the morning as well as the number of students they carry. The traffic counts are not announced in advance, taking place on random school or summer session days. St. Matthew's has been required to maintain a 52% compliance level from 1997 through 2014 and, as of 2015, the requirement has increase to 62% compliance. In addition, on an annual average, no more than 240 vehicles carrying students shall arrive at school for morning student drop off.
The most recent Wiltec Carpool Count of 2018 along with reports from 2004 are posted below.