Cafodd y system ei gosod ar ôl i'r data radar a gasglwyd rhwng 8 Mawrth a 27 Mawrth 2018 ddangos bod 217,642 o gerbydau wedi bod yn teithio ar gyflymder o dros 70mya ar gerbytffordd Allt Rhuallt tua'r gorllewin.
The system was installed after radar data collected between 8 March and 27 March 2018 found 217,642 vehicles had been travelling at speeds of more than 70mph on the Rhuallt Hill westbound carriageway.