**2. State of play**

In this section an overview of the literature review regarding the Vehicle to Vehicle communication (V2V) and the vehicle to infrastructure communications (V2I) and in particular the driving assistance services, and the urban traffic control problem is provided.

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*Centralised Traffic Control and Green Light Optimal Speed Advisory Procedure in Mixed…*

The vehicle to vehicle communication is based on the idea that vehicles may exchange information about position, speed and location. In general, most relevant enhancements in the research field of the driving assistance refer to the cooperative awareness aiming to support the active road safety and the traffic efficiency to guarantee the speed management and the road navigation. A more detailed descrip-

Firstly, the Hazardous Location Notifications (HLN) category may be identified; this kind of services aims to provide road' users about hazardous situations in particular in terms of location, type, expected duration, etc. These services may be further classified in terms of Emergency electronic Brake Light (EBL) for warning drivers of hard braking by vehicles ahead; Emergency Vehicle Approaching (EVA) for providing an early warning of approaching emergency vehicles; Slow or Stationary Vehicle (SSV) for warning drivers about slow or stationary/broken down vehicles ahead; Traffic Jam ahead Warning (TJW) able to provide an alert to the driver that in traffic jam conditions reaches the end of the queue tail; Road Works Warning (RWW) aiming to inform drivers about works on the roads; Intersection movement assist (IMA) that warms drivers of vehicles approaching from a lateral

Further services within HLN category concern the collision risk minimisation (i.e. Cooperative Collision Risk Warning, CCRW) and the drivers of motorcycles

Other kinds of applications refer to the vehicle to infrastructure communications and in particular to the signage; as the in-Vehicle SiGNage (VSGN) aiming at providing users' with road signs advanced information in the vehicle surroundings (this may facilitate drivers' gap at the signalised junctions), the in-Vehicle SPeeD limits (VSPD), aiming to provide users' with speed limits as well the ShockWave Damping (SWD) service able to recommend drivers about the optimal speed to be adopted by displaying the information in the vehicle. More in general there are the vulnerable road user (VRU) applications aiming at targeting crashes in case of vulnerable situations (for instance work areas, pedestrian detections, presence of

Other enhanced applications in case of urban contexts are Green Light Optimal

Concerning the Green Light Optimal Speed Advisory (GLOSA) this is able to provide drivers with speed advice when they are approaching the traffic lights in order to uniformly mitigate the driving conditions by reducing the impact of acceleration/braking. With reference to the Signal Violation/Intersection safety (SigV) and the Traffic Signal Priority (TSP) these are respectively a safety-critical task focusing on the reduction of the number and severity of collisions at signalised intersections and a service able to guarantee the priority at signalised junctions of

Finally, other services are also referred to the in vehicle - infotainment applications that may be adopted in order to provide drivers with different kinds of information not only in terms of routes but also in terms of available services as

An overview of the main V2V and V2I applications is provided in the following

In general, it may be argued that in general vehicles are already connected devices; the development of an integrated framework combining the above

Speed Advisory (GLOSA), Signal Violation/Intersection safety (SigV), Traffic

warning (i.e. Motor Cycle Approaching indication, MCA).

specific vehicles as emergency vehicles, public transport, etc.

**2.1 Vehicle to vehicle (V2V) /to infrastructure communication (V2I):** 

*DOI: http://dx.doi.org/10.5772/intechopen.95247*

**the driving assistance**

tion is provided in the following.

position to the junction.

emergency vehicles).

Signal Priority etc.

parking or charging stations.

table (see **Table 1**).

*Centralised Traffic Control and Green Light Optimal Speed Advisory Procedure in Mixed… DOI: http://dx.doi.org/10.5772/intechopen.95247*
