Subject: Infrastructure and nodes

> 1. the node is in the infrastructure or not?

The infrastructure is in the nodes.

> 2. How do the nodes communicate with each other, by wireless?

Yes.

> 3. Do the vehicles communicate each other by the nodes?

A vehicle is a kind of node, and nodes can communicate.

> 4. Will the sensor automatically directly send the information to the
> infrastructure or the traffic control system?

The infrastructure.

> 5. How do the vehicles share the information?

The requirements do not specify sharing information.  They only say that
resources (such as streets and intersections) may be shared and that
information may be requested.  Read the requirements carefully.

> 6. How do the nodes implement the negotiation, just by communication
> between nodes?

Probably, although that is not explicitly specified.

> 7. How do the sensors compare the location a vehicle claims to be at with
> the location the vehicles is observed to be at? How do the sensors get
> the location a vehicle claims to be?

The requirements never say that sensors can compare locations.  Read the
requirements carefully.