Police are asking motorists in the south of the Island to keep their eyes out for horses this weekend.
TREC IOM is holding a two-day event around Port Erin and Port St Mary today and on Sunday.
The competition, which involves orienteering, will see a large number of riders and their mounts out and about on the roads.
Officers are asking people to be considerate and safe when driving past them.
Bin service urges people to stop tossing batteries
TT course road closure causing bus diversions today
MHK queries government worker expenses
Steam Packet sailings delayed tonight
PPE Medpro put into liquidation
Part of TT course closed tomorrow
Carl Cox backs cancer charity's TT fundraising auction
Business appeal over thousands in unpaid bills