The Institute of Advanced Motorists has discovered four people have been caught at speeds in excess of 120mph on roads in Wales in 2014 - with one even being caught at 136mph.
This is one of the worst cases of speeding caught on a safety camera in Great Britain in the past year.
The findings come as a result of a Freedom of Information request made by the IAM.
The charity made the request to the four Welsh police forces, asking for details of their top five instances of excessive speeding captured on safety cameras on their roads in 2014.
Wales' worst speeder was recorded by North Wales Police at 136mph on the A5 Ty Nant to Dinmael road in Conwy, which has a speed limit of 60mph - thus breaking the limit by 76mph.
The A5 also saw two further instances of 120mph-plus recorded; 122mph on the Ty Nant-Cerrigydrudion stretch in Conwy; and 121mph at Halton, Wrexham.
The final case of 120mph being exceeded in Wales was captured by South Wales Police: 125mph on the M4 between Junction 35 Pencoed and Junction 34 Miskin, where a 70mph limit is in force.