Some thought that locals were keeping to 20mph but those travelling through, commercial vehicle drivers and those not from the area were more likely to ignore it.
Roedd rhai’n credu bod pobl leol yn cadw at 20mya ond bod y rhai oedd yn teithio drwodd, gyrwyr cerbydau masnachol a’r rhai oedd ddim o’r ardal yn fwy tebygol o’i anwybyddu.