the logical model of Distributed CAC (Context-Aware Computing) in the IIoT is very suitable for the development of intelligent services for smart cities. See Figure 5 in my presentation: Intelligent IoT (IIoT) - Replicating human cognition in the Internet of Things;
There, Fig. 10 illustrates the idea for the realization of V2I (Vehicle to Infrastructure) and V2V (Vehicle to Vehicle). The realization of V2I and V2V will be of great importance for Smart Cities.
The idea of Swarm Intelligence in the IIoT will also be of great importance in Smart Cities. Fig. 13 in my IIoT presentation shows an example of this.
The concept of Digital Twin Federation (DTF) provides the basis for achieving climate neutrality in smart cities in the future. See Fig. 10 in my presentation Digital Twins in IoT;