This sport has traveled over the pond and into the states. Irish Road Bowling is a competitive sport where all you need is a cannon ball and back country roads.
According to the Official Web-Site of Bol Chumann na hEireann:
The sport Road Bowling Ball is played with a 28 oz. (793.8 grams) solid iron bowl, or ball, with a circumference of approximately 18 centimetres. Two contestants match their individual skills in throwing the bowl with optimum speed, controlled delivery, and international accuracy along a carefully considered and tactically selected play – path over a predetermined course distance of normal roadway. The winner is the player to reach the finishing line in the least number of throws or shots.
Official Web-Site of Bol Chumann na hEireann – http://www.irishroadbowling.ie/index.htm
Photo 1 – www.yourlifechoices.com.au
Photo 2 – www.wvirishroadbowling.com