The justice minister says she isn't able to predict the impact proposed 20mph limits will have on speeding offences.
Jane Poole-Wilson responded to a question in the House of Keys this week from Douglas Central MHK Chris Thomas.
She also said existing data from the police and courts about past speeding offences couldn't be analysed in that way.
The minister went on to explain why she personally couldn't make predictions about the future:
Two more schemes backed by government fund
Island to get Bikesafe scheme for first time
Jurby Junk's Stella dies aged 90
No plans to publish UK's assisted dying letters
Burst water main disrupts Onchan supply
Government advice following spike in data breaches
Plans for four-foot flood walls at Ramsey harbour
Garage blaze in the early hours of this morning