This is my first map model work,
It is located on the sanora highway near the prison, referred to as border control
Installation instructions

1.need
Map Builder 1.09.1
https://www.gta5-mods.com/tools/map-builder  
 Some models are made through it, otherwise they will not be generated

2.maps Copy folder to   Grand Theft Auto V\mods\update\x64\dlcpacks\ inside

3.  add to  <Item>dlcpacks:/maps/</Item> GO   Grand Theft Auto V\mods\update\update.rpf\common\data  dlclist.xml  inside

Known problems,
If the distance is too long, the vehicle will drive under the road. I hope someone knows how to repair this. Thank you

About me
Here comes a novice from China