To limit the probability that liquid will escape and spread outside of the fuel dispensing station area, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons nearby.
To limit the probability that ignition sources outside of the fuel dispensing station area will ignite vapour, which could lead to a fire or explosion involving the vehicle being refuelled, which could lead to harm to persons nearby.
To limit the probability that vehicles will become involved in a collision while being refuelled, which could lead to a fire or explosion, which could lead to harm to persons.