what don't you understand about counting lanes ?

LA is 17 miles wide, that's 90,000 feet wide. in that width there are only two major freeways ( 5 and 405 ) both 14 lanes wide, if we add some smaller roads let's say that brings the total up to 50 lanes.

a lane is 12 feet wide. 90,000 feet is enough space for 7,500 lanes. even if we use only 10% of that space for freeway lanes that's 750 lanes. 750/50 = 15.

they could realistically increase the throughput of their freeways 15X if they wanted to WITHOUT stacking. then with 4 level stack that would be 60X throughput, and that is still using just 10% of LA width for freeways.

with effective van-pooling that could be increased to 200X throughput, and with computer controlled cars that can follow each other at a fixed distance without creating traffic shock waves to perhaps 500X.

but instead the Urbanists simply tell us that there is nothing we can do and therefore we will not just give up but go in the OPPOSITE direction by dismantling EXISTING lanes.