NFSU2 Map in GTA 5 is a total map conversion from Need For Speed Underground 2 (NFSU2) mod originally developed for Grand Theft Auto 4 (GTA 4) by Cesar Design.
All content belongs to EA Black Box.
Tooling:
RenderDoc by Baldur Karlsson, Map Models Import by eliemichel, OpenIV by OpenIV team, Cityscape by Pixelactive, CodeWalker by dexyfex, GIMS EVO and GIMS IV by 3Doomer.
Credits:
Cesar Design, EncryptedReality
Very good game