Australian outback truckers covering enormous distances on rugged and unsealed roads needs to equip their rigs with special modifications. They include a huge bull-bar (roo-bar), a sheet of wire mesh for windscreen protection, special dust filters, additional long range fuel tanks, heavy duty wheels, air conditioning and an array of different driving lights. Bulk goods are normally transported in Road Trains, which can have up to 3 trailers with a total length of over 31 metres.