I created the real one-way traffic at the Griffith Observatory.
I was inspired by Google Street View and my own visit to the Griffith Observatory.
I tried to recreate everything as accurately as it looks on Google Street View.

Please back up the original data before installing.

For this mod you need the "custom maps" folder. But I don't know where to download it and "increased props". You can find it here: https://www.gta5-hub.com/tools/increased-props-add-on

Installation:

Follow the folders in the ZIP.

For "custom maps" copy the custom_maps folder to: mods\update\x64\dlcpacks.

Then edit the dlclist.xml in: mods\update\update.rpf\common\data
Add: dlcpacks:/custom_maps/.