Gridguide is a centralised, automated traffic control system. When within its jurisdictional area, vehicles are guided and advised by its management systems. This covers both traffic routing around the city, managing flow for minimal congestion, and second-to-second control for accident avoidance and junctions.
Gridguide’s area is expansive but not total. It covers all major roads throughout the city, and all minor roads in downtown areas. It fades out in side-streets in the suburbs and is completely absent in the Barrens.
In game terms, GridGuide acts as a special sort of WAN that all vehicles are connected to. This does not provide the usual anti-hacking protection that WANs do, but it does provide the following game benefits:
As a very well-defended cloud host, hacking Gridguide directly is extremely difficult. However, Gridguide uses a distributed architecture with delegated controls to short-range local hosts, responsible for vehicle control across a small area as well as associated infrastructure like traffic lights. These are vulnerable to hacking in the usual way. They count as standalone devices with a d8 rating. Once a decker gains access, they can issue commands to all nearby connected devices, including vehicles - one hacking roll per command. Note that this will often quickly attract attention from GOD, however it can still be used to facilitate a speedy escape.