Brisbane and Gold Coast drivers will need to lower their speed by 10 kilometres per hour on the M1 from today or prepare to face hefty fines.

In an attempt to improve road safety ahead of the Commonwealth Games in April, the 110km/h speed limit on the busy motorway will be dropped to 100km/h and 100km/h dropped to 90km/h.

Transport Minister Mark Bailey says considering its extensive advertising there will be no grace period, the new speed limits will be enforced immediately and the Queensland Government are unapologetic for it.