To limit the probability of a fire or explosion hazard [e.g. due to an ignition source located outside a designated fuel-dispensing area or due to proximity to open flames, building openings, or other hazards], which could lead to the ignition of vapour, which could lead to harm to persons.
To limit the probability that liquid will escape and spread outside the filling area, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.
To limit the probability that a vehicle will be involved in a vehicular accident or that objects will make impact on the vehicle while it is being refuelled, which could lead to damage to the vehicle, which could lead to the escape of liquid, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.