Complex sentence: For instance, they may prohibit using certain roads without special tires in times of snow; typically, smoking or leaving the motor running while filling one's car tank is prohibited by a prefectoral "arrêté".
Split into simpler sentences: For instance, they may prohibit the use of certain roads without special tyres in times of snow. The prohibition on smoking or leaving the motor running while filling the fuel tank of a motor vehicle is another example of a matter typically decided by prefectoral "arrêté".