More than half of L.A. County freeways are considered to be highly congested during the morning and evening commutes, the report said.
The Congestion Management Program says there are some areas where you're guaranteed to be stuck in traffic, including the Santa Monica (10) Freeway between the East L.A. interchange and the San Diego (405) Freeway, the 5 Freeway between State Route 170 and State Route 2, and the 5 Freeway between Lakewood Boulevard and the Orange County line.
Overall, the county's report shows congestion levels have remained fairly constant from 1991 to 2009.
With growth in California, new lanes were needed on Southern California freeways. Between 1995 and 2009, construction permits were issued for more than 208,000 residential units in L.A. County.
In the last 18 years, more carpool lanes have been added - more than 480 miles with funding from the MTA. That amounts to 34 percent of the HOV mileage in California.
Interstate 210 was extended eastbound, and Interstate 105 was also added since 1992.
Do you want the Eyewitness News team to call you? Get a FREE Morning Wake-up Call and personalized weather report at abc7.com/wakeup