An apparatus deployable within a first vehicle for providing driver initiated vehicle-to-vehicle warnings, said apparatus comprising: an input interface (104; 218) arranged to receive input from a user in the first vehicle; and a vehicle-to-vehicle communications component (210, 214) arranged to: generate a message upon having received the input from the input interface, said message having embedded electronic data indicating the location of a first event observed by said user; and broadcast said generated message regarding the first event from the first vehicle to at least one second vehicle within the broadcast range of the vehicle-to-vehicle communications component; wherein said vehicle-to-vehicle communications component (210, 214) is further arranged to receive a message regarding a second event generated and broadcast by a third vehicle; and wherein said apparatus further comprises: a risk filter component arranged to determine whether the received message is applicable to the first vehicle based at least on a location of the second event embedded in said received message; and a warning component arranged to issue a warning to a driver of the first vehicle if said received message is determined to be applicable to said first vehicle by the risk filter component; wherein said vehicle-to-vehicle communications component (210, 214) is further arranged to: generate a stop message indicating the second event has ended in response to an input received on the input interface (104; 218) following an issuance of a warning by the warning component; and broadcast said generated stop message to at least one fourth vehicle within the broadcast range of the vehicle-to-vehicle communications component. an input interface (104; 218) arranged to receive input from a user in the first vehicle; and a vehicle-to-vehicle communications component (210, 214) arranged to: generate a message upon having received the input from the input interface, said message having embedded electronic data indicating the location of a first event observed by said user; and broadcast said generated message regarding the first event from the first vehicle to at least one second vehicle within the broadcast range of the vehicle-to-vehicle communications component; generate a message upon having received the input from the input interface, said message having embedded electronic data indicating the location of a first event observed by said user; and broadcast said generated message regarding the first event from the first vehicle to at least one second vehicle within the broadcast range of the vehicle-to-vehicle communications component; wherein said vehicle-to-vehicle communications component (210, 214) is further arranged to receive a message regarding a second event generated and broadcast by a third vehicle; and a risk filter component arranged to determine whether the received message is applicable to the first vehicle based at least on a location of the second event embedded in said received message; and a warning component arranged to issue a warning to a driver of the first vehicle if said received message is determined to be applicable to said first vehicle by the risk filter component; generate a stop message indicating the second event has ended in response to an input received on the input interface (104; 218) following an issuance of a warning by the warning component; and broadcast said generated stop message to at least one fourth vehicle within the broadcast range of the vehicle-to-vehicle communications component.