Daily traffic counts;

I-405 - CA 133 - Irvine: 220,000 - 12 lanes
I-405 - Jamboree Rd - Irvine: 271,000 - 12 lanes
I-405 - CA 55 - Costa Mesa: 303,000
I-405 - Beach Blvd - Huntington Beach: 251,000
I-405 - CA 22 - Westminster: 394,000
I-405 - Palo Verde Ave - Long Beach: 271,000
I-405 - I-710 - Long Beach: 297,000
I-405 - I-110 - Carson: 272,000
I-405 - I-105 - Inglewood: 340,000
I-405 - CA 90 - Marina Del Ray: 314,000
I-405 - Santa Monica Blvd - Los Angeles: 321,000
I-405 - U.S. 101 - Los Angeles: 278,000
I-405 - Sherman Way - Los Angeles: 229,000
I-405 - Between CA 118 and I-5: 140,000

from 2002?

The north-south San Diego Freeway (I-405) provides four free flow lanes and one carpool lane in each direction. Average daily traffic volume on the I-405 Freeway at Victory Boulevard is approximately 236,000 vehicles per day. Using the freeway capacity of 2,000 vehicles per hour (VPH) per lane for the mixed flow lanes and 1,600 vehicles per hour for the carpool lane, the I- 405 Freeway provides a theoretical free flow capacity of approximately 19,200 VPH. Current non-directional peak hour traffic volume on the I-405 Freeway is approximately 15,000 VPH based upon counts conducted by Caltrans. Therefore, this segment of the freeway is operating at approximately 78 percent capacity.

from 2007

http://cityplanning.lacity.org/EIR/G....K_Traffic.pdf

I-405 is one of the busiest freeways in the country. Try the 405 at rush hour stop and go 10 MPH a lot of the way ...