Zones and AccessRestrictions are used to model things like:
- gated communities, where only trips beginning or ending at a building in the neighborhood may use any of the private roads
- Stay Healthy Streets, where most car traffic is banned, except for trips beginning/ending in the zone
- Congestion capping, where only so many cars per hour can enter the zone
A contiguous set of roads with access restrictions. This is derived from all the map’s roads and kept cached for performance.