Motorcycles are driven through a river in an attempt to gauge their reliability in these circumstances.
Item title reads - The Water Splash. One of the numerous obstacles in A.C.U. West of England Reliability Trials. Wales.
We see four men riding their motorcycles through a river, one gets stuck and the motorcycle starts steaming, another man helps him out. Two more motorcycles drive through, and then a man rides a motorcycle and sidecar through it.