Glen in San Diego there is 5 mph traffic weekday mornings and afternoons.
Then visitor traffic on Saturday morning and Sunday afternoon on the 5 between LA and San Diego.
Since I'm retired I choose not to drive during those hours.
Now when it's not bumper to bumper the speed limit is 65 but in San Diego I rarely ever see a CHiP.
Freeway is frequently 75 to 85/90 here too, you're just surrounded by other speeding aggressive drivers.
Navy stationed me in NZY/Coronado in 1980 and I never left.