I thought at first they were a new form of moving target for the javelin throwers and this one had scored a silver, but no—-BMW is using a fleet of remote control Mini Coopers to help speed up the London 2012 athletics, by collecting thrown discuses, hammers, shots and javelins from the field and returning them to athletes.
see HERE

 I thought at first they were a new form of moving target for the javelin throwers and this one had scored a silver, but no—-BMW is using a fleet of remote control Mini Coopers to help speed up the London 2012 athletics, by collecting thrown discuses, hammers, shots and javelins from the field and returning them to athletes.

see HERE