According to https://dot.ca.gov/programs/traffic-operations/census/traffic-volumes/2017/route-101 https://dot.ca.gov/programs/traffic-operations/census/traffi..

According to https://dot.ca.gov/programs/traffic-operations/census/traffic-volumes/2017/route-101 https://dot.ca.gov/programs/traffic-operations/census/traffi..., ~125,000 cars drive through that area per day (scroll to "JCT. RTE. 85", divide by 2). According to the report, the previous collision was 2 months earlier, so ~7.5Million cars passed through there. 99.9999% doesn't seem that far off.