Crude rally track through Raton Canyon.

Install:
1. Download and install Map Editor and everything Map Editor needs to function.
2. Extract the .zip and put "rallypass.xml" in GTA V's main directory.
3. Load up GTA V in story mode. Press "F7" to open Map Editor.
4. Select "Load map" -> XML. Type "rallypass" and hit enter.
5. Wait a couple of seconds. Done.

Summary:
Install Map editor and eveything that it brings. (scripthookV, nativeUI, etc...)
Drag and drop "rallypass.xml" here -> C:\Program Files (x86)\Steam\SteamApps\common\Grand Theft Auto V
Type "rallypass" in Map Editor. Done.