To exempt certain fuel dispensing stations from the application of Sentence 4.6.8.1.(1), which would otherwise require attendants, and permit unattended fuel dispensing stations [self-service outlets], if certain conditions are met [the stations do not serve the general public and the fuel dispensing is done by authorized customers, i.e. having received proper training or instructions in safe dispensing procedures].
These conditions are to limit the probability of the escape of liquid, which could lead to harm to the public.