Horses have been used
throughout history for work and transport and were probably driven before they were used for riding.
Tutankhamun's Tomb (1361-1352 BC) included a chariot! Horses were
used for pulling guns and military wagons, as well as for ploughing and
pulling carriages and wagons containing goods and people. Most horse driving is now
for leisure rather than work, although horses are still extensively used
in third world countries. They are also returning to favour for
work in forestry.
There are show ring classes for different types of turnouts (and horses), judged on the quality of the turnout (horse, vehicle, harness and driver) and 'performance'. Driving trials are based on eventing, with the three competitions - dressage, marathon, and obstacle driving - scored on a penalty system.
a Harness Horse
Click on the picture to order the book or search for more books on driving here.
Horse Driving Trials Association
Carriage Driving Association