The  Traveller is a continuous move irrigation system that uses a big gun sprinkler or a boom mounted on a wheel or trailer, fed by a flexible hose or by a soft hose, which is on a reel or on a spoon . The hose is run-out and during operation, the stationary hose reel rotates rolling the hard hose back onto the reel, puling the sprinkler/boom back to the machine - Hard Hose/Boom Traveller -  or the four wheel stance with the sprinkler is moving back on a stainless steel or galvanized cable - Soft Hose Traveller -. They are powered track or wheeled vehicles that tow a high pressure flexible hose connected to the water supply main pipeline. Based of the type of the flexible hose, they are called Hard Hose - hose tow -  or Soft Hose Travellers - cable tow - (HHT or SHT). 

The operating pressure can be between 3.5 - 13 bar. Manufacturer's catalogue usually shows the machine type, big gun/sprinkler type, nozzle sizes (mm), wetted width (m), flow rates (L/sec or m³/hr), pressure (bar), hose diameter (mm), hose length (mm), area irrigated per run (ha) and the possible application rates for 6 - 7.5 - 8 - 11 or 22 hours run.

With its medium to large droplets and application rates, varying from 10 - 15 - 20 - 25 - 30 - 35 - 40 - 50 - 60 mm,   the travellers are best suited to agricultural fields with coarse soils having high intake rates and to crops providing good ground cover.

They are very popular and effective machines for irrigating pasture, fodder crops, vegetables and practically any field crops. They are not that expensive, easy to operate and move.

It is suitable for waste water applications, as well.